★ SOSA Vaayu · the 500 sq ft practice
At 150–200 square feet the machine question is already settled, and every remaining decision that changes how the room reads is about where the thing stands and what it is set to
★ ★ ★ ★ ★
★★★★★
"We measured the waiting area and it came to 176 square feet. The eighteen-hundred-rupee machine was the whole answer, and I had been quoted six times that elsewhere."
practice owner · sized at 176 sq ft
★★★★★
"Moving it off the counter and onto the far shelf was a bigger change than anything we did to the setting. Same machine, different room."
clinic manager · moved off the reception counter
★★★★★
"Ours had been sitting directly under the split unit, which is why it kept disappearing. Nobody had mentioned the return air until this page."
consultant · moved away from the AC return
★★★★★
"The four-hour timer instead of steady running was the change that made me comfortable keeping it at all."
operations lead · 4H timer instead of steady
★★★★★
"Halving the drops was free and it fixed a complaint we had been treating as a placement problem."
practice owner · dose halved
★★★★★
"We keep the remote in one drawer and everybody on the desk knows where it is. That was the last piece of the setup."
centre manager · remote at the desk
★★★★★
"We measured the waiting area and it came to 176 square feet. The eighteen-hundred-rupee machine was the whole answer, and I had been quoted six times that elsewhere."
practice owner · sized at 176 sq ft
★★★★★
"Moving it off the counter and onto the far shelf was a bigger change than anything we did to the setting. Same machine, different room."
clinic manager · moved off the reception counter
★★★★★
"Ours had been sitting directly under the split unit, which is why it kept disappearing. Nobody had mentioned the return air until this page."
consultant · moved away from the AC return
★★★★★
"The four-hour timer instead of steady running was the change that made me comfortable keeping it at all."
operations lead · 4H timer instead of steady
★★★★★
"Halving the drops was free and it fixed a complaint we had been treating as a placement problem."
practice owner · dose halved
★★★★★
"We keep the remote in one drawer and everybody on the desk knows where it is. That was the last piece of the setup."
centre manager · remote at the desk
★ ★ The sized product for a 150–200 sq ft zone ₹1,899 The passive alternative, at two or three reeds ₹849
✓ A 500 sq ft practice is not a 500 sq ft scenting job — the sized number is reception plus waiting, usually 150–200 sq ft ✓ Freestanding in the arrival zone, away from the corridor to consultation — never mounted into shared HVAC in a clinical building ✓ Free shipping above ₹499 · a portion of every order funds girl-child education
Founder Diaries · Eye Clinic Scenting · 500 Sq Ft
Placement beats specification here. Far end of the zone from the corridor to consultation, waist to chest height, clear of the air-conditioning return, off the reception counter, out of the door swing.
Use the timers, not steady. A 2H or 4H window means the source is not still emitting at its morning rate into an evening room that has been filling all day.
Never mount a diffuser into shared HVAC in a clinical building. Ducting fragrance into central air is exactly how it reaches examination and consultation rooms. Freestanding in reception is the correct installation, and at ₹1,899 there is nothing to install anyway.
Hotel Collection₹299 · ₹999 · ₹1,799The SOSA range has one machine rated between 150 and 320 sq ft and it is the Sukoon. Boond at ₹899 is rated ~150 sq ft, which puts it at the very bottom of this band; Megh at ₹3,499 is rated ~215 sq ft, which is less than the Sukoon it costs ₹1,600 more than, and is therefore a runtime and humidity machine rather than a coverage upgrade; Safar at ₹3,999 has no published coverage figure at all and is a personal-scale object at 20ml and 6.9cm. Above the band, a Vaayu at ₹11,999 is rated up to 1000 m³, roughly 2,000–3,000 sq ft, which against a 175 sq ft zone is more than eleven times what you need. Its real merits — under 38 dB, key-lock, scheduled run windows, day selection — answer problems a 500 sq ft practice does not have, and if you ever do buy one, note that SOSA does not currently sell a separate Vaayu cold-air refill oil: the 400ml in the box lasts roughly 90+ days and is the whole supply available at the time of writing, so confirm availability before committing. That is the whole band, and it is why this page is not a comparison exercise.
Sukoon · the sized product here₹1,899Shop → 
Hotel Collection · ₹6.00 a ml at 300ml₹999Shop → 
Mountain Breeze · no power, no controls₹849Shop →
SOSA range, specifications and prices used in this guide (verified August 2026): Vaayu ₹11,999 — waterless cold-air nebulisation of undiluted fragrance oil; no water, no heat, no added humidity, no white mineral dust. Coverage up to 1000 m³, about 2,000–3,000 sq ft. 400ml refillable tank lasting roughly 90+ days at a mid setting. Bluetooth app plus onboard controls, 1h / 4h / 8h / 24h run windows, day selection, adjustable intensity, auto-stop and key-lock. Under 38 dB. DC 12V / 1A, 5W. Freestanding or wall / HVAC mount. CE, RoHS and SGS certified. SOSA does not currently sell a separate Vaayu cold-air refill oil; the 400ml supplied in the box is the fragrance available at the time of writing, so a practice planning continuous or multi-site use should confirm current refill availability with SOSA before committing. The water-based Hotel Collection is made for ultrasonic machines and must not be used in a Vaayu. Other machines: Boond 300ml ₹899 (~150 sq ft, ultrasonic) · Sukoon 500ml ₹1,899 (270–320 sq ft, 16–18 hours on low, remote and steady/2H/4H timers, three 15ml fragrances included, ultrasonic) · Megh 6L ₹3,499 (~215 sq ft — a runtime and humidity machine that covers less than a Sukoon, never a coverage upgrade) · Safar ₹3,999 (waterless cold diffusion, cordless, 20ml, about 6.9cm, three speeds, 1/2/3-hour auto-off — sold as a car and travel diffuser, personal-scale only; SOSA publishes no coverage figure for it) · Aangan ₹25,999 (HVAC nebulising, ~8,000–10,000 sq ft) · Meenar ₹38,500 (commercial HVAC, 12,000–18,000 sq ft). Water-based Hotel Collection for ultrasonic machines: 15ml ₹299 · 100ml ₹999 · 300ml ₹1,799 · pack of seven ₹1,799; scents are inspired by the atmosphere of well-known hotels — SOSA is an independent Indian brand and is not affiliated with, endorsed by or supplying any hotel group. Reed diffusers ₹749–₹1,349 (50ml 6–8 weeks, 130ml 14–18 weeks, six fibre reeds, no 100ml size; replacement reeds are not sold separately). Reed oil cannot be used in an ultrasonic machine and Hotel Collection oil cannot be used in reeds. SOSA sells no room spray or home spray — every SOSA spray is a car perfume. Nothing in this guide is medical, clinical or safety advice. A fragrance diffuser adds a scent to the air. It does not clean, purify, filter, sanitise or disinfect air, does not remove or neutralise disinfectant, damp or occupancy smells, and has no effect on comfort, anxiety, waiting time, recovery or any clinical outcome. Some people are sensitive to airborne fragrance, which is why this guide recommends that examination rooms, diagnostic areas, consultation cabins, procedure suites and post-operative areas remain fragrance-free, that a fragrance-free seating option always exist, and that a diffuser is never mounted into shared HVAC in a clinical building. Decisions about clinical policy, ventilation standards, infection control and patient suitability rest entirely with the practice and its clinicians. A persistent stale, damp or disinfectant smell is a ventilation, moisture or cleaning problem — SOSA sells no dehumidifier and no air purifier, and fragrance should never be used to cover one. Coverage, runtime and longevity figures are manufacturer specifications and typical ranges, not guarantees, and vary with room volume, ceiling height, air exchange, occupancy and season. SOSA publishes no commercial or bulk pricing, no corporate account, no annual maintenance contract, no installation service, no stated warranty term and no multi-location programme; warranty length, spare parts, servicing and app platform availability are unconfirmed, and larger or multi-site enquiries should go through the contact page before any commitment. Composed and made in small batches in Pune, India. Free shipping above ₹499. A portion of every order supports girl-child education through Nanhi Kali. Prices subject to change — see the live product pages.
A 500 sq ft ophthalmology practice sounds like a machine decision and it is not. Once you subtract two consultation cabins or one cabin and a diagnostics suite, a refraction lane, the corridor between them, a toilet and a records store, the room you are actually scenting — reception plus waiting — comes out at about 150–200 sq ft. That band has exactly one sized product in the SOSA range, and it is the Sukoon at ₹1,899. Rated 270–320 sq ft, 16–18 hours on low, with a remote, steady, 2H and 4H timer modes and three 15ml scents in the box. That is the answer, it takes one paragraph, and I would rather spend the rest of this page on the decision that genuinely separates a good 500 sq ft clinic from a poor one: where the machine stands, and what it is set to. At this size placement moves the room more than product choice does, and it is the part nobody writes about because it does not sell anything.
Quick answers — read this first
Sukoon ₹1,899 is the sized product for a 150–200 sq ft arrival zone. It runs with modest headroom at that size, which means the lowest mode and a light dose rather than a bigger machine.Placement beats specification here. Far end of the zone from the corridor to consultation, waist to chest height, clear of the air-conditioning return, off the reception counter, out of the door swing.
Use the timers, not steady. A 2H or 4H window means the source is not still emitting at its morning rate into an evening room that has been filling all day.
Never mount a diffuser into shared HVAC in a clinical building. Ducting fragrance into central air is exactly how it reaches examination and consultation rooms. Freestanding in reception is the correct installation, and at ₹1,899 there is nothing to install anyway.
The short answer
Short answer: one Sukoon at ₹1,899, on its lowest mode, dosed at about half the drops you would instinctively use, on a 2H or 4H timer, standing at the far end of the waiting area from the corridor mouth, at waist-to-chest height, at least a couple of metres from the air-conditioning return and off the reception counter. The remote lives in a named drawer and everybody on the desk may use it.
Why not a reed diffuser: you can use one, and at the lower end of this band it is a fair choice at ₹749–₹1,349. But a reed has no schedule, no off switch and no way down except pulling reeds out, and at 150–200 sq ft with long waits the controls are worth the extra ₹550–₹1,150.
Where to shop: Sukoon ₹1,899 with the three 15ml scents in the box, then Hotel Collection 100ml ₹999 or 300ml ₹1,799 when they run out. Free shipping above ₹499.
In this guide
270–320 sq ft, remote, steady, 2H and 4H timers — the sized product for a 150–200 sq ft arrival zone
Sukoon 500ml · ₹1,899
Water-based fragrance for ultrasonic machines — ₹1,799 ÷ 300 = ₹6.00 a millilitre on the largest size
Hotel Collection · 15ml ₹299 · 300ml ₹1,799
The passive alternative at the lower end of this band, run at two or three of six reeds
Mountain Breeze · ₹849 / 50ml
What is the best fragrance setup for a 500 sq ft eye clinic?
Straight answer
1. Measure the arrival zone and buy against that number only. A 500 sq ft practice typically resolves as 500 − 120 − 110 − 90 − 30 − 25 = 125 sq ft, or a little more where the waiting area is generous; across the plans I am sent, 150–200 sq ft is the usual answer. The clinical rooms and the corridor contribute nothing, because they take nothing.
2. At 150–200 sq ft the sized product is a Sukoon at ₹1,899. Rated 270–320 sq ft, so it carries modest headroom — which is an instruction to run it low rather than a reason to buy larger.
3. Set it before you site it, then site it properly. Lowest mode. Half the drops you would instinctively add. A 2H or 4H timer rather than steady. Then place it at the far end of the waiting area from the corridor to consultation.
4. Waist to chest height, roughly 90–110 cm, on a shelf or console rather than on the floor. On the floor it under-reads and collects dust; above head height it is both conspicuous and harder to reach for whoever needs to switch it off.
5. Keep it away from the air-conditioning return and out of the door swing. A machine sited under a return grille is feeding the one part of the room that pulls air away fastest, which is why a clinic can own the right machine and still describe it as disappearing by eleven o'clock.
6. Not on the reception counter. It is the most convenient surface and usually the worst position: the counter is near the corridor mouth in most plans, it is where staff sit all day, and a machine in front of a patient's face while they give their details is more presence than a clinic wants.
7. Never into shared HVAC. Do not let anybody duct a diffuser into central air conditioning in a clinical building — that is precisely how fragrance reaches examination rooms, diagnostics and the procedure area, and it is the one installation I will not endorse at any size.
8. Give the desk the remote and keep a seat the fragrance does not reach. Some people are sensitive to airborne fragrance, and a practice that scents its reception should be able to seat somebody away from it without ceremony. Nothing goes past the consultation door in any format at any level, and that boundary is the practice's own clinical judgement. Nothing here is medical, clinical, ventilation or regulatory advice. Composed and made in small batches in Pune, and a portion of every order supports girl-child education through Nanhi Kali.
2. At 150–200 sq ft the sized product is a Sukoon at ₹1,899. Rated 270–320 sq ft, so it carries modest headroom — which is an instruction to run it low rather than a reason to buy larger.
3. Set it before you site it, then site it properly. Lowest mode. Half the drops you would instinctively add. A 2H or 4H timer rather than steady. Then place it at the far end of the waiting area from the corridor to consultation.
4. Waist to chest height, roughly 90–110 cm, on a shelf or console rather than on the floor. On the floor it under-reads and collects dust; above head height it is both conspicuous and harder to reach for whoever needs to switch it off.
5. Keep it away from the air-conditioning return and out of the door swing. A machine sited under a return grille is feeding the one part of the room that pulls air away fastest, which is why a clinic can own the right machine and still describe it as disappearing by eleven o'clock.
6. Not on the reception counter. It is the most convenient surface and usually the worst position: the counter is near the corridor mouth in most plans, it is where staff sit all day, and a machine in front of a patient's face while they give their details is more presence than a clinic wants.
7. Never into shared HVAC. Do not let anybody duct a diffuser into central air conditioning in a clinical building — that is precisely how fragrance reaches examination rooms, diagnostics and the procedure area, and it is the one installation I will not endorse at any size.
8. Give the desk the remote and keep a seat the fragrance does not reach. Some people are sensitive to airborne fragrance, and a practice that scents its reception should be able to seat somebody away from it without ceremony. Nothing goes past the consultation door in any format at any level, and that boundary is the practice's own clinical judgement. Nothing here is medical, clinical, ventilation or regulatory advice. Composed and made in small batches in Pune, and a portion of every order supports girl-child education through Nanhi Kali.
TL;DR: a 500 sq ft ophthalmology practice is a 150–200 sq ft scenting job, and the Sukoon at ₹1,899 is the sized product for it. Lowest mode, half the drops, 2H or 4H timer rather than steady, standing at the far end of the waiting area from the corridor, at waist-to-chest height, clear of the air-conditioning return and off the reception counter. Remote in a named drawer, anybody on the desk may use it, and nothing is ever ducted into shared HVAC.
The sized product for this building, and how to run it
SOSA Sukoon · 500ml ultrasonic, remote and timers ₹1,899
Rated 270–320 sq ft, 500ml tank, 16–18 hours on low, remote control, steady, 2H and 4H modes, and three 15ml Hotel Collection scents supplied in the box. Against a 150–200 sq ft arrival zone it is the closest sized product in the range, and the modest headroom is the reason to run it at the bottom of its range rather than a reason to look at anything larger. Dose light — the number of drops in the tank is the cheapest volume control an ultrasonic has, and I would start at half of whatever seems reasonable and raise it only if nobody has noticed after a fortnight. Use the timed modes deliberately: a clinic reception at five in the afternoon is not the room you set at nine in the morning, and a 4H window means the machine is not still adding at its morning rate into an evening room. Two honest limits, both mechanism rather than fault. It adds humidity, because that is what an ultrasonic does, so in a monsoon month I would leave it off. And it takes water-based Hotel Collection fragrance only — 15ml ₹299, 100ml ₹999 which is ₹999 ÷ 100 = ₹9.99 a millilitre, 300ml ₹1,799 which is ₹1,799 ÷ 300 = ₹6.00, and a pack of seven 15ml at ₹1,799 which is 7 × 15 = 105ml, so ₹1,799 ÷ 105 = ₹17.13 a millilitre; that pack buys variety, not value. Reed oil cannot go in it and nothing water-based goes in a Vaayu. It adds a scent to the room and removes nothing that is already there.
Part one — why 500 sq ft lands on one product
The product half of this question is short, and I would rather resolve it quickly and spend the length of the page on what actually varies. Three things make 500 sq ft a settled decision rather than an open one.
1
THE SUM · TWO-THIRDS OF THE FLOOR LEAVES FIRST
A 500 sq ft practice has more rooms than a 350 sq ft one, and every extra room is subtracted rather than added
This is the part that surprises practices moving up from a smaller unit: the extra two hundred square feet almost never go into the waiting room. They go into a second consultation cabin, a dedicated diagnostics room, a larger optical display or a proper store — and of those, only the optical display can ever join the sizing sum, and only if it opens off the waiting area rather than off the clinical corridor. So a 500 sq ft plan and a 350 sq ft plan often have arrival zones within thirty square feet of each other. The one genuine difference is that a 500 sq ft practice more often has a waiting area at the upper end of 150–200 sq ft with longer sight lines and more seating, which is where a passive bottle starts to leave a corner untouched and a machine starts to earn its keep. Measure yours rather than assuming: two dimensions, multiplied, with the reception counter counted in and the corridor counted out.
The principle: extra floor area in an eye clinic buys clinical rooms, and clinical rooms contribute zero to the sizing sum.
2
THE BAND · 150–320 SQ FT HAS ONE ANSWER
Below the band a bottle is enough and above it a Vaayu starts to make sense — in the middle there is one sized machine
Hotel Collection₹299 · ₹999 · ₹1,799The SOSA range has one machine rated between 150 and 320 sq ft and it is the Sukoon. Boond at ₹899 is rated ~150 sq ft, which puts it at the very bottom of this band; Megh at ₹3,499 is rated ~215 sq ft, which is less than the Sukoon it costs ₹1,600 more than, and is therefore a runtime and humidity machine rather than a coverage upgrade; Safar at ₹3,999 has no published coverage figure at all and is a personal-scale object at 20ml and 6.9cm. Above the band, a Vaayu at ₹11,999 is rated up to 1000 m³, roughly 2,000–3,000 sq ft, which against a 175 sq ft zone is more than eleven times what you need. Its real merits — under 38 dB, key-lock, scheduled run windows, day selection — answer problems a 500 sq ft practice does not have, and if you ever do buy one, note that SOSA does not currently sell a separate Vaayu cold-air refill oil: the 400ml in the box lasts roughly 90+ days and is the whole supply available at the time of writing, so confirm availability before committing. That is the whole band, and it is why this page is not a comparison exercise.
The correction: a bigger tank is not a bigger room. Runtime, humidity and coverage are three different specifications and only one of them is sizing.
3
THE VARIABLE THAT REMAINS · PLACEMENT
Two identical machines in the same room read completely differently depending on where they stand
Once the product is settled, everything that still varies is siting and setting, and the range within them is wider than people expect. The same Sukoon on the same setting will read as absent in one position and as obvious in another, because a room is not a uniform volume — it has a door that swings, a return grille that pulls, a corridor mouth that leaks, and a seating bank where people sit still for forty minutes. The three positional errors I see most often in a 500 sq ft plan are all understandable: on the reception counter, because that is the surface with a socket; under the split unit, because that is the empty wall; and beside the corridor, because that is where the console table happens to be. Each of them produces a different complaint — too present at the desk, disappears by mid-morning, and drifts towards consultation — and each is solved by moving the machine rather than by changing the setting. Move first, adjust second. That order costs nothing and it is the sequence most practices get backwards.
Part two — the arrival-zone bands, and what each one takes
The honest sizing bands, with what is oversized and undersized at each. Read the starred row, because a 500 sq ft ophthalmology practice almost always lands in it — and notice that the band names an arrival zone, never a clinic.
The bands
Six arrival-zone sizes, the sized product, and what is wrong on either side of it
| Arrival zone | What that room is usually like | The sized product | What is oversized for it | What is undersized for it |
|---|---|---|---|---|
| 150–200 sq ft ★ — the typical 500 sq ft practice | One open reception and waiting bank, 10–16 seats, a corridor off one corner | Sukoon ₹1,899, lowest mode, 2H or 4H timer | Vaayu ₹11,999 — around eleven times the rated coverage required | Nothing, really — a single bottle also works at the lower end, with fewer controls |
| Under 100 sq ft | A counter and six or eight chairs, often with no window | One reed diffuser ₹749–₹1,349 at two reeds | Any machine at all; and two bottles instead of one | Nothing. This size is generously served by the cheapest option in the range |
| 100–150 sq ft | Compact waiting, one seating wall, corridor close to the desk | A reed diffuser, or Boond ₹899 if you want dosing and an automatic stop | Megh ₹3,499, which costs more for less coverage than a Sukoon | Nothing — but placement is tight, so the far end from the corridor matters more here |
| 200–320 sq ft | A larger waiting hall, sometimes with an optical display in the same volume | Sukoon ₹1,899, at the top of its rated range | Vaayu, until the zone is genuinely past about 320 sq ft | A single reed bottle, which will leave the far corner untouched |
| 320–800 sq ft of one connected public zone | Open double-height reception, or several patient areas on one air path | Vaayu ₹11,999 — freestanding, scheduled, key-locked, under 38 dB | Aangan ₹25,999 at this size | Ultrasonics, singly or in pairs — two machines fighting is not coverage |
| 3,000+ sq ft of connected public area | A large eye hospital concourse rather than a clinic reception | Aangan ₹25,999, and above that Meenar ₹38,500 | Nothing in the range is oversized at this scale | Everything smaller, including a Vaayu |
| The honest caveat: every band above describes an arrival zone — reception plus waiting — and never a clinic's total floor area. Examination rooms, diagnostic areas, consultation cabins, the procedure suite and any post-operative area take nothing, in any format, at any level, and that boundary is the practice's own clinical judgement rather than a supplier's recommendation. No diffuser of any size should be mounted into shared HVAC in a clinical building, because ducting fragrance into central air is precisely how it reaches the rooms it must not reach; freestanding in reception, away from the corridor to consultation, is the correct placement. Coverage figures are manufacturer specifications and vary with ceiling height, air exchange and occupancy. Nothing on this page is medical, clinical, ventilation, infection-control or regulatory advice; no claim is made in either direction about how any patient or member of staff perceives, tolerates or responds to fragrance, and no SOSA product or setting is described as safe, unsafe or suitable for any group. Some people are sensitive to airborne fragrance, which is why the clinical pathway stays fragrance-free and why a fragrance-free seat must genuinely exist somewhere a person would ordinarily sit. A diffuser adds a scent alongside what is already in the air and removes nothing. | ||||
Shop this guide
The sized machine, what goes in it, and the passive alternative
Sukoon · the sized product here₹1,899Shop → Hotel Collection · ₹6.00 a ml at 300ml₹999Shop → Mountain Breeze · no power, no controls₹849Shop →
The SOSA principle
At 150–200 square feet the machine question answers itself, which means the money and the attention should go somewhere else. Where the thing stands changes the room more than what the thing is, and moving it costs nothing.
Far end from the corridor, waist to chest, clear of the return grille, off the counter, and on a timer.
Part three — the 500 sq ft practice that should not do this
Being the right size for a product is not the same as being the right practice for one, and there are three versions of a 500 sq ft clinic where I would say no. The first is the plan where the waiting area and the clinical corridor are one continuous volume with no door between them. This is more common at 500 sq ft than at 350, because the extra area often arrives as an open passage rather than a proper corridor. If a patient can walk from the seating to the door of a consultation cabin without passing through a doorway, you do not have two spaces, you have one — and anything you put into the front half is in the back half too. No setting fixes that, and no placement fully fixes it either. The honest answer is either a door, or nothing. A door is a builder's job and it is not something I sell.
The second is a caseload question. A practice with a substantial paediatric list sharing the same waiting room, a large elderly caseload, or a book weighted towards post-operative review has more reason than most to leave the arrival zone unscented — not because of any claim about how anybody responds to fragrance, which is not mine to make, but because the design has less margin and less to gain. There is a related test worth applying literally at this size: can you seat somebody, in a chair they would ordinarily sit in, far enough from the source that the difference is real, without crossing the room or being singled out? At 150–200 sq ft with two seating banks the answer is usually yes, and a Sukoon makes it easier still because it can simply be switched off from the desk. If the answer is no, the design is not finished.
The third is a practice whose actual problem is an odour rather than an absence of one. If your reception smells of disinfectant, of damp, of a closed building or of the day's accumulation, adding a scent produces a compound rather than a solution — fragrance adds alongside what is already in the air and removes nothing, and a medical building where two smells sit together is read as one having been put there to cover the other. Find the source, fix the ventilation or the cleaning schedule, and come back to this decision afterwards with a clean baseline. Otherwise you will set your level against a problem room and be left with a setting that is wrong once the room improves. And keep the target in view: the correct intensity in a clinic is lower than in a salon, a showroom or a hotel lobby. A patient should notice the room is pleasant without being able to name a fragrance. If they can name it, it is too strong.
At this size you are not choosing a machine, you are choosing a position. The same Sukoon on the same setting is two different rooms depending on whether it stands beside the corridor or at the far end of the seating.
— Sonal Sahani, SOSA
Part four — the set-up sheet, decision by decision
Nine decisions, what to set each to, how to verify it and what it costs to change later. This is the page's real content: the product took one line, and the setup takes the rest.
The set-up sheet
What to set, why, how to check it, and the cost of changing your mind
| Decision | Set it to | Why | How to verify | Cost to change later |
|---|---|---|---|---|
| Position in the room ★ | Far end of the waiting bank from the corridor mouth | The corridor is the entrance to the clinical pathway, and distance is the only free boundary you have | Stand in the corridor doorway for ten seconds after being outside. You should get nothing | Nothing — pick it up and move it |
| Height | Waist to chest, roughly 90–110 cm, on a shelf or console | Floor level under-reads and collects dust; above head height is conspicuous and hard to reach | Sit in the nearest chair. You should not be looking at it | Nothing, if the socket reaches |
| Distance from the air-conditioning return | As far as the room allows — never directly beneath it | A return grille pulls the room's air away fastest at that point | Hold a tissue near the grille. If it moves, that corner is the wrong corner | Nothing |
| Distance from the entrance door swing | Out of the arc, and not in the first metre of the doorway | Door swing is the biggest single air movement in a clinic reception | Watch the door for one busy ten-minute period | Nothing |
| Mode | Lowest, always | Clinic intensity is lower than retail or hospitality intensity, deliberately | Ask whether a patient can name the fragrance. If yes, it is too strong | Nothing — it is a button |
| Dose | About half the drops you would instinctively use | Drops in the tank are the cheapest and finest volume control an ultrasonic has | Judge from the furthest chair after forty minutes, not from the doorway | The price of the fill you are part-way through |
| Timer | 2H or 4H windows, not steady | A room fills through the day; a source that does not stop keeps adding to the peak | Compare five o'clock against eleven o'clock with somebody who has been outside | Nothing |
| Who may switch it off | Anybody on the desk, immediately, without asking | A control that requires permission is not a control | Ask a junior team member where the remote is. They should know | Nothing, but it needs saying out loud once |
| Installation type | Freestanding, plugged into a socket. Never ducted into HVAC | Ducting fragrance into central air puts it into examination and consultation rooms | If anybody proposes an HVAC integration, that is the answer to decline | Considerable, which is why it belongs at the planning stage |
Honest notes for buyers: never mount a Vaayu or any diffuser into shared HVAC in a clinical building. Coverage figures are manufacturer specifications and vary with ceiling height, air exchange and occupancy; the Sukoon is rated 270–320 sq ft, Boond ~150 sq ft, Megh ~215 sq ft — less than a Sukoon, so it is a runtime and humidity machine and never a coverage upgrade — and Safar at ₹3,999 has no published coverage figure at all. Every ultrasonic in the range adds humidity by design. Hotel Collection water-based fragrance is for ultrasonic machines only: 15ml ₹299, 100ml ₹999 which is ₹999 ÷ 100 = ₹9.99 a millilitre, 300ml ₹1,799 which is ₹1,799 ÷ 300 = ₹6.00, and a pack of seven 15ml at ₹1,799 which is 7 × 15 = 105ml, so ₹1,799 ÷ 105 = ₹17.13 a millilitre — the pack buys variety, not value. The Hotel Collection scents are inspired by reference only; SOSA is independent and unaffiliated, and no hotel group is a SOSA customer, partner or reference. Reed oil cannot go in an ultrasonic machine, water-based Hotel Collection cannot go in a reed bottle, and neither goes in a Vaayu; there is no hotel-inspired reed diffuser. Reed strength figures are positions on SOSA's own internal scale at six reeds, not an industry standard, a concentration or a quality ranking; at six reeds a 50ml lasts 6–8 weeks and a 130ml 14–18 weeks, and oil-only refills are 300ml ₹2,399, which is ₹2,399 ÷ 300 = ₹8.00 a millilitre, or 500ml ₹3,499, which is ₹3,499 ÷ 500 = ₹7.00, against ₹749 ÷ 50 = ₹14.98 for the smallest bottle. Replacement reeds are not sold separately. Honest gaps in the reed range: no oud, no musk-forward composition, no aquatic. SOSA does not currently sell a separate Vaayu cold-air refill oil; the 400ml supplied in the box lasts roughly 90+ days and is the whole supply available at the time of writing, so a practice planning continuous or multi-site use must confirm current refill availability with SOSA before committing, and the water-based Hotel Collection is never a substitute for it. A diffuser adds a scent alongside what is already in the air and removes nothing — no masking, neutralising, purifying or air-cleaning — and SOSA sells no air purifier, no dehumidifier and no room spray, since every SOSA spray is a car perfume. Nothing here is medical, clinical, ventilation, infection-control or regulatory advice; no claim is made in either direction about how anyone perceives or responds to fragrance, and no product or setting is described as safe, unsafe or suitable for any group. No claim is made about comfort, anxiety, perceived waiting time, recovery, ratings, footfall or revenue. SOSA publishes no bulk pricing, corporate account, maintenance contract, installation service, warranty term, delivery window or multi-site programme; ask through the contact page before committing. Free shipping above ₹499.
The passive alternative, and when I would choose it instead
SOSA Mountain Breeze · Himalayan pine, sage & Indian cedar ₹849 / 50ml
Dry pine and sage over Indian cedar, with no sweetness and no floral weight, at 9.4 on SOSA's own internal strength scale — a position measured at six reeds, not an industry standard, a concentration or a quality ranking. At the lower end of a 150–200 sq ft arrival zone a single bottle at two or three reeds is a perfectly honest answer, and I would choose it over the machine in two specific cases: a practice that does not want a powered object in its reception at all, and a practice whose reception has no sensible socket away from the corridor. What you give up is every control. A reed diffuser emits from the moment it is filled until it is carried out; there is no schedule, no off switch, and the only volume adjustment is how many of the six supplied reeds are standing in the bottle. What you gain is silence, no humidity, nothing to plug in and nothing to maintain. Alcohol-free, phthalate-free, paraben-free and low-VOC on a heat-stable coconut-derived carrier, in a refillable glass bottle with six fibre reeds — fibre rather than rattan, because rattan's pores clog in Indian humidity — tested through 45°C heat and 85% monsoon humidity. At six reeds a 50ml lasts 6–8 weeks and the 130ml at ₹1,349 lasts 14–18 weeks: size buys duration, never reach. Stand it on a tray, out of direct sun, at the far end of the zone from the corridor.
SS
ISIPCA
Versailles
Versailles
A note from Sonal
A practice manager at a two-doctor clinic wrote to say the machine they had bought on my own recommendation was "not working". It was a Sukoon, the room was 176 square feet, and on paper the specification was right. She had been about to order a second one.
I asked for a photograph of the room rather than the settings. It arrived within the hour and answered the question: the machine was on the reception counter, eighteen inches from the corridor doorway, directly below the indoor unit of the split air conditioner. Three errors in one position. It was reading strongly at the desk where her staff sat all day, it was disappearing from the far seating because the return was pulling it away, and whatever was left was heading straight down the corridor towards consultation.
She moved it to a low shelf at the opposite end of the seating bank, put it on the four-hour timer, and halved the drops. Nothing else changed — same machine, same fragrance, same room. She wrote back a fortnight later to say it was finally doing what she had bought it for, and that the second machine she had been about to order would have made everything worse. That is the whole of this page. At this size you are buying a position, not a product. Composed and made in small batches in Pune, and a part of every order funds a girl's classroom through Nanhi Kali.
Frequently asked questions
My clinic is 500 sq ft but the waiting area is only 120. What changes?
Then you are in the band below and the answer moves with the room rather than with the lease. At 120 sq ft a single reed diffuser at ₹749–₹1,349 run at two of its six reeds is generously sufficient, and a Boond at ₹899 is the machine option if you want dosing by drops and an automatic stop after roughly six hours a fill. A Sukoon still works — it simply has more headroom than the room needs, which means running it lower still. The rule the whole family turns on is that you size to the arrival zone and never to the clinic, and that rule works downwards as strictly as it works upwards.
Can I run one machine for both reception and my optical display?
Only if they are genuinely one connected volume with no clinical air path between them — which usually means the optical section opens off the waiting area rather than off the corridor to consultation. Where that is true, one Sukoon sited between the two, closer to whichever has the longer dwell time, is the correct arrangement, and two machines in one volume is not: they do not add coverage, they add inconsistency. Where the optical display opens off the clinical corridor, treat it as part of that pathway and leave it alone, however commercially tempting it is. That is a floor-plan question rather than a product question, and it is worth answering with a pen on the plan before anything is bought.
Should the machine go into our air conditioning so the whole clinic is consistent?
No. This is the one recommendation in this cluster I will not qualify. A Vaayu can be wall or HVAC mounted and in a hotel or a showroom that is a reasonable installation; in a clinic it is not, because the entire argument for scenting the front of the building rests on the clinical pathway staying fragrance-free, and ducting fragrance into central air delivers it into examination rooms, diagnostics, consultation cabins and the procedure suite. Consistency across a clinic is not the goal — a boundary is. Freestanding in the arrival zone, away from the corridor, is the correct installation at every size, and at ₹1,899 there is nothing to install in the first place.
How much will the fragrance cost me to run per year?
Less than most practices expect, and the arithmetic is worth doing rather than estimating. The Sukoon at ₹1,899 comes with three 15ml Hotel Collection scents in the box. After that, a 100ml at ₹999 is ₹999 ÷ 100 = ₹9.99 a millilitre and a 300ml at ₹1,799 is ₹1,799 ÷ 300 = ₹6.00 a millilitre, so the larger size is a little over a third cheaper per millilitre. The pack of seven 15ml at ₹1,799 is 7 × 15 = 105ml, or ₹1,799 ÷ 105 = ₹17.13 a millilitre — that pack is for trying scents, not for running a reception. Consumption depends entirely on how many drops you use and how many hours you run, and a clinic dosing light on a 4H window uses very little. SOSA publishes no bulk or commercial pricing, so if you want to plan a year's supply across sites, ask through the contact page rather than assuming a slab exists.
Is a Vaayu ever right for a 500 sq ft practice?
Only if the arrival zone itself is unusually large — a genuinely open reception past about 320 sq ft, which in a 500 sq ft building would mean almost everything except one or two rooms, and that is rare in ophthalmology because the speciality needs enclosed, darkened rooms. On a normal plan, a Vaayu at ₹11,999 against a 175 sq ft zone is more than eleven times the rated coverage required and would run permanently at the bottom of its range. Its genuine clinic strengths are under 38 dB, key-lock so staff cannot raise it, and scheduled run windows with day selection — real operational features, but answers to a larger building's problems. And before anybody commits, note the supply position: SOSA does not currently sell a separate Vaayu cold-air refill oil, so the 400ml in the box, lasting roughly 90+ days, is the whole supply available at the time of writing. Confirm availability with SOSA first.
Eye clinics · size and machine choice
One Sukoon ₹1,899, and then get the position right
A 500 sq ft ophthalmology practice is a 150–200 sq ft arrival zone once the clinical rooms and the corridor are subtracted, and that band has one sized product. Lowest mode, about half the drops you would instinctively use, a 2H or 4H timer rather than steady. Stand it at the far end of the waiting bank from the corridor mouth, at waist-to-chest height, clear of the air-conditioning return and out of the door swing — not on the reception counter. Give everybody on the desk the remote and a fragrance-free seat that genuinely exists. Never duct it into shared HVAC. The clinical pathway stays fragrance-free. Free shipping above ₹499.
Sukoon ₹1,899 → Mountain Breeze ₹849
Continue the read
More on size and machine choice
- How to scent a 300–400 sq ft eye clinic — the subtraction, stated for the first time.
- A 750 sq ft clinic with separate testing areas — why more rooms means more boundaries, not more machine.
- What makes sense at 1,000 sq ft and when a clinic genuinely needs a Vaayu.
- One machine or several zones in a large clinic — why two machines in one volume is not coverage.
- Brand: the SOSA founder story.
Editorial standards & sources
About this guide: Written by Sonal Sahani, ISIPCA Versailles-trained founder and perfumer at SOSA Home & Body. It sizes a 500 sq ft ophthalmology practice to its arrival zone rather than its floor area, names the Sukoon at ₹1,899 as the sized product for 150–200 sq ft, and sets out placement and settings in detail. Coverage figures are manufacturer specifications; reed strength positions are on SOSA's own internal scale at six reeds. Hotel Collection scents are inspired-by references only and SOSA is independent and unaffiliated; no hotel group is a SOSA customer, partner or reference. Nothing here is medical, clinical, ventilation, infection-control or regulatory advice, and no clinical outcome, patient response, safety property or business result is claimed. A diffuser adds a scent and removes nothing. No competitor is named or rated.SOSA range, specifications and prices used in this guide (verified August 2026): Vaayu ₹11,999 — waterless cold-air nebulisation of undiluted fragrance oil; no water, no heat, no added humidity, no white mineral dust. Coverage up to 1000 m³, about 2,000–3,000 sq ft. 400ml refillable tank lasting roughly 90+ days at a mid setting. Bluetooth app plus onboard controls, 1h / 4h / 8h / 24h run windows, day selection, adjustable intensity, auto-stop and key-lock. Under 38 dB. DC 12V / 1A, 5W. Freestanding or wall / HVAC mount. CE, RoHS and SGS certified. SOSA does not currently sell a separate Vaayu cold-air refill oil; the 400ml supplied in the box is the fragrance available at the time of writing, so a practice planning continuous or multi-site use should confirm current refill availability with SOSA before committing. The water-based Hotel Collection is made for ultrasonic machines and must not be used in a Vaayu. Other machines: Boond 300ml ₹899 (~150 sq ft, ultrasonic) · Sukoon 500ml ₹1,899 (270–320 sq ft, 16–18 hours on low, remote and steady/2H/4H timers, three 15ml fragrances included, ultrasonic) · Megh 6L ₹3,499 (~215 sq ft — a runtime and humidity machine that covers less than a Sukoon, never a coverage upgrade) · Safar ₹3,999 (waterless cold diffusion, cordless, 20ml, about 6.9cm, three speeds, 1/2/3-hour auto-off — sold as a car and travel diffuser, personal-scale only; SOSA publishes no coverage figure for it) · Aangan ₹25,999 (HVAC nebulising, ~8,000–10,000 sq ft) · Meenar ₹38,500 (commercial HVAC, 12,000–18,000 sq ft). Water-based Hotel Collection for ultrasonic machines: 15ml ₹299 · 100ml ₹999 · 300ml ₹1,799 · pack of seven ₹1,799; scents are inspired by the atmosphere of well-known hotels — SOSA is an independent Indian brand and is not affiliated with, endorsed by or supplying any hotel group. Reed diffusers ₹749–₹1,349 (50ml 6–8 weeks, 130ml 14–18 weeks, six fibre reeds, no 100ml size; replacement reeds are not sold separately). Reed oil cannot be used in an ultrasonic machine and Hotel Collection oil cannot be used in reeds. SOSA sells no room spray or home spray — every SOSA spray is a car perfume. Nothing in this guide is medical, clinical or safety advice. A fragrance diffuser adds a scent to the air. It does not clean, purify, filter, sanitise or disinfect air, does not remove or neutralise disinfectant, damp or occupancy smells, and has no effect on comfort, anxiety, waiting time, recovery or any clinical outcome. Some people are sensitive to airborne fragrance, which is why this guide recommends that examination rooms, diagnostic areas, consultation cabins, procedure suites and post-operative areas remain fragrance-free, that a fragrance-free seating option always exist, and that a diffuser is never mounted into shared HVAC in a clinical building. Decisions about clinical policy, ventilation standards, infection control and patient suitability rest entirely with the practice and its clinicians. A persistent stale, damp or disinfectant smell is a ventilation, moisture or cleaning problem — SOSA sells no dehumidifier and no air purifier, and fragrance should never be used to cover one. Coverage, runtime and longevity figures are manufacturer specifications and typical ranges, not guarantees, and vary with room volume, ceiling height, air exchange, occupancy and season. SOSA publishes no commercial or bulk pricing, no corporate account, no annual maintenance contract, no installation service, no stated warranty term and no multi-location programme; warranty length, spare parts, servicing and app platform availability are unconfirmed, and larger or multi-site enquiries should go through the contact page before any commitment. Composed and made in small batches in Pune, India. Free shipping above ₹499. A portion of every order supports girl-child education through Nanhi Kali. Prices subject to change — see the live product pages.