Air handling comes first for a reason that is purely economic: separate air handling for the public half and the clinical half is the decision everything else rests on, and it is the one item on this list that cannot be retrofitted cheaply. Today it is a line in the services brief. In year three it is a shutdown, a ceiling out and a bill that makes the whole fragrance question look absurd. You are at the only moment when this is free, and that is the single most valuable thing about the position you are in.
The rest follows in a chain. Extraction decides what the building smells of before anything is added. Waste handling decides whether extraction is enough. The fragrance-free list decides where the boundary physically is. The boundary decides your connected public volume. The volume decides the machine. And the signature - one register, held - decides nothing about the hardware at all, which is why it is the cheapest item on the page and the one people start with.
This is the last page in the SOSA healthcare bank and it is written to be the most complete one in it, so it runs long and it does the arithmetic by hand on a worked 6,500 sq ft plan. It ends where the whole bank has been heading: the boundary is the product, not the machine.
Where exactly does the fragrance boundary go on the drawing? At the last real door - a leaf that closes, in a building whose air handling agrees with it. A curtain is not an air boundary. An archway is not an air boundary. A screen is not an air boundary. A sign reading "clinical area" is emphatically not one. If the last thing between your scented public circulation and the clinical zone is an opening, the boundary is wherever the next closing door is, and every room in between goes on the fragrance-free list even if it looks public.
How much of a 6,500 sq ft day-care hospital ends up scented? On the worked plan here, one connected public body of about 823 cubic metres inside a building holding roughly 2,031 cubic metres of air - so about 1,208 cubic metres gets nothing. A supplier working from floor area alone would have quoted against 6,500 sq ft at 12 ft, which is 78,000 cubic feet or about 2,210 cubic metres, nearly three times what you are actually addressing. One SOSA Vaayu at ₹11,999, rated for approximately 1000 cubic metres of connected air, covers the real number with margin.
One: air handling. Public half and clinical half on separate air handling, supply and return both, with pressure relationships designed at the doors between them and a schedule recording which unit serves which named room. First because it is the only item that genuinely cannot be retrofitted cheaply, and because every later step depends on knowing whether your two halves are one body of air or two.
Two: ventilation and extraction. Washrooms, the pantry, the waste holding room, the sluice, and anywhere soiled material sits even briefly. This is what decides what your building smells of before anything is added to it, and it is the step most often left to be "sorted on site".
Three: waste and odour control, as an operational design question rather than a product one. Where waste is held, how often it leaves, and by what route. A waste route that crosses public circulation is a design fault, and it is a fault that no fragrance in existence can answer, because fragrance adds scent and does not remove odour.
Four: the fragrance-free clinical areas. Named rooms on the drawing, a reason beside each, signed by your clinical and infection-control leads, with the boundary at the last real door. This is where the scented area of your building is actually defined, and it usually turns out smaller than the architect assumed.
Five: reception and the lounges. Now, and only now, you know your connected public volume, because you know which doors close and what the air handling does. Size against that number alone - floor area times ceiling height, divided by 35.3 - and never against the building's footprint.
Six: the signature. One register, chosen once, held. This costs nothing, it is not a hardware decision, and it is where almost everybody starts and where it actually belongs.
Seven: the machine. Placement last: inside the public volume, out of the supply throw, away from the return, never in the connecting corridor, never ducted into or placed in air handling serving a clinical zone, on a live socket with no cable crossing a wheelchair or trolley route, on a timer that follows your OPD hours.
Now why this order and not another. Because every one of those steps constrains the next, and if you take them out of sequence you make a decision using information you do not have yet. Choose a machine before you know the connected volume and you have sized against a floor plan. Draw the fragrance-free list before you know the air handling and you have drawn a line that the ceiling void ignores. Design the waste route after the layout is frozen and you get the route that was left over. Choose the register first - which everybody does, because it is the enjoyable part - and nothing bad happens at all, which is precisely why it stays at step six rather than step one: it is the step that does not constrain anything.
And the thing the whole sequence is really building. Not a scented hospital. A building whose public half can carry an identity because its clinical half is genuinely, physically, separately handled - and where that separation was designed rather than asserted. A portion of every SOSA order supports girl-child education through Nanhi Kali.
If you are the architect or the project director reading this, the most useful thing I can give you is a sense of proportion. The scenting element of a premium day-care hospital is, at most, a ₹11,999 machine and a fragrance that starts at ₹299. Everything else on the list above is your building. It would be absurd for a fragrance supplier to sit at the top of that hierarchy, and I am not going to pretend otherwise in order to sell a machine. What a fragrance supplier can usefully tell you is which of your design decisions will later constrain the small one, which is the whole content of this page.
The second framing worth carrying: this sequence is mostly about not needing fragrance. A building with separated air handling, honest extraction, a waste route that does not cross public circulation and a properly written clinical boundary already smells of almost nothing in particular - which is exactly what a premium day-care hospital is trying to smell of. A hospital that smells expensive smells of almost nothing. The register at the end is a small signature laid over a building that was already right, and if the building is not right the register will make it worse rather than better, because two smells in one lobby make a third that reads worse than either.
Third, the governance point, and it is not a formality at design stage. What may be introduced into the air of a building with a surgical zone is decided by that facility's clinical leadership, its infection-control policy and its facilities engineering. This page does not know what your policy says, will not characterise it, will not name any standard or accreditation body, and does not claim to satisfy anything. Bring the clinical and infection-control leads into the sequence at step one rather than showing them a finished scheme at step seven, because a boundary they helped draw is a boundary they will defend, and a boundary handed to them is a document.
And fourth, design in the accommodation now rather than discovering it later: a named unit that anybody on the front desk can switch off without finding a manager, and a front-of-house team who are in that air eight to ten hours a day and whose report of a reaction is a recalibration signal rather than a tolerance problem.
The design sequence in full - seven steps, in the only order that works
Take a worked plan, because this page is useless without one. A 6,500 sq ft premium day-care hospital, new build, and every ceiling assumption stated - a double-height entrance at 18 ft, the rest of the public half at 12 ft, the premium patient lounge and public washrooms at 10 ft, consultation rooms at 9 ft, and the whole clinical zone at 10 ft because a procedure room carries a great deal of service above the ceiling.
The public half, 2,580 sq ft. Entrance lobby 520 sq ft at 18 ft = 9,360 cubic feet, about 265 cubic metres. Reception and billing 420 at 12 = 5,040 cubic feet, about 143 cubic metres. Consultation waiting 380 at 12 = 4,560 cubic feet, about 129 cubic metres. Attendant and family lounge 620 at 12 = 7,440 cubic feet, about 211 cubic metres. Premium patient lounge 240 at 10 = 2,400 cubic feet, about 68 cubic metres. Public circulation 220 at 12 = 2,640 cubic feet, about 75 cubic metres. Public washrooms 180 at 10 = 1,800 cubic feet, about 51 cubic metres - extracted, and never scented.
The connected public body. Lobby, reception, waiting, lounge and circulation, all open to one another: 9,360 + 5,040 + 4,560 + 7,440 + 2,640 = 29,040 cubic feet, about 823 cubic metres. The premium patient lounge sits behind a door that stays shut, so it is a separate 2,400 cubic feet or about 68 cubic metres and gets its own decision, which on this plan is a much lower level or nothing at all. If you left that door open you would have 31,440 cubic feet, about 891 cubic metres, as one body - which is a good illustration of how a single door changes the sum you are buying against.
The consultation rooms, 750 sq ft. Five at 150 sq ft and 9 ft. Each is 1,350 cubic feet, about 38 cubic metres; the five together are 6,750 cubic feet, about 191 cubic metres. Doors shut, five separate small volumes, and a small volume over-scents faster than anything in the public half. Nothing of their own.
The clinical half, 3,170 sq ft at 10 ft = 31,700 cubic feet, about 898 cubic metres. Pre-op and admission bays 400, procedure room A 360, procedure room B 360, minor procedure 240, first-stage recovery 300, second-stage recovery 420, sterile and decontamination 300, clinical and drug storage 200, clinical waste holding 100, clinical pantry 90, staff change and rest 200, clinical corridor 200. Every cubic metre of that gets nothing. Not a lower setting. Nothing.
The whole building. 29,040 + 2,400 + 1,800 + 6,750 + 31,700 = 71,690 cubic feet, about 2,031 cubic metres. Now the subtraction that reframes the entire purchase: 2,031 minus 823 is 1,208 cubic metres of your new hospital that gets nothing, which is about 59 per cent of its air. And note what a supplier sizing from the floor plan would have quoted against: 6,500 sq ft at a flat 12 ft is 78,000 cubic feet, about 2,210 cubic metres - nearly three times the volume you are actually addressing, and the reason so many facilities are sold a machine two sizes too large and then spend a year turning it down.
Against 823 cubic metres, one SOSA Vaayu at ₹11,999 - approximately 1000 cubic metres of connected air, with SOSA's own copy also stating 2,000 to 3,000 sq ft scented evenly - covers the connected public half of a 6,500 sq ft premium hospital, with margin. Margin means you run it lower. It does not mean you have capacity to spend somewhere else.
What "separate" has to cover: separate supply, which is the half everybody means and the half that survives design review; separate return, which is the half that gets lost, because in a great many fit-outs the return is not a duct at all but the ceiling void, and a void is one continuous space over the whole floor plate unless somebody deliberately builds a barrier in it; designed pressure relationships at the doors that join the two halves, so air moves in the direction the engineer intended rather than the direction it happens to find; separate control and hours, so the public side runs with your OPD hours; and a written schedule of which unit serves which named room, kept with the as-builts, because buildings drift and a boundary drawn in 2026 gets breached in 2031 by a well-meant alteration.
Ask your mechanical consultant one question in these words: is the return path above the ceiling continuous between the public and clinical zones? The answer decides more than the doors do. And hold two rules absolutely: a scenting unit is never ducted into, mounted inside or placed in air handling that serves a clinical zone; and no change is ever made to a hospital's air handling in order to make fragrance last longer - not a damper closed a little, not an extract on a lower speed, not a diffuser blanked off. Ventilation wins.
Step two: ventilation and extraction where it earns its keep. Washrooms, the pantry, the clinical pantry, the sluice, the waste holding room, and anywhere soiled material sits even briefly. Extraction in those rooms is source control, it is the reason a well-run building smells of nothing in particular, and it is precisely what fragrance most often gets bought to compensate for after the fact. On this plan the public washrooms are 180 sq ft, about 51 cubic metres, and they are on the extraction list rather than the scenting list - a scented washroom in a hospital reads as covering something in the most literal way available. Specify it properly, commission it properly, and have somebody check that the fans are actually running, because a failed extract fan is silent and nobody reports it until the room announces itself.
Step three: waste and odour control as an operational design question. This is the one architects most often treat as a room on a plan rather than as a process, and it is where a premium building is most often quietly let down. Three questions, and all three are design decisions rather than housekeeping ones.
Where is waste held? On this plan the clinical waste holding room is 100 sq ft at 10 ft, 1,000 cubic feet, about 28 cubic metres - a small, enclosed, mechanically extracted room with a door that closes, sited away from public circulation. It is 100 square feet out of 6,500, and it will do more to determine whether your lobby reads as premium than any other 100 square feet in the building.
How often does it leave? A holding room is a holding room, not a store. The frequency of removal is a service-contract and operational decision that belongs in the operational brief now rather than being discovered in month two, because the amount of time material spends in that room is the single biggest variable in what the surrounding corridor smells like.
By what route? This is the design question and it is the one to get right on the drawing. The route from the clinical zone to the waste holding room, and from there out of the building, must not cross public circulation, must not pass the attendant lounge, and must not share the lobby with arriving patients. If your only route out is through the front of house, you do not have a fragrance problem and you never will have a fragrance solution - you have a circulation fault, and it is cheap to fix today and impossible to fix later.
And the flat statement that belongs with all three steps: fragrance adds scent and does not remove odour. Not disinfectant, not a waste route, not a failed extract fan, not damp in a sofa. A scent laid over any of those does not cancel it - it makes a third smell, and in an enclosed lobby the third one reads worse than either of the two that made it. Source, then ventilation, then cleaning, then fragrance. In that order, always, and steps one to three are the first three of those.
Write it as named rooms, not as a category. Not "clinical areas". On this plan: Pre-op and Admission Bays, Procedure Room A, Procedure Room B, Minor Procedure, First-Stage Recovery, Second-Stage Recovery, Sterile and Decontamination, Clinical and Drug Storage, Clinical Waste Holding, Clinical Pantry, Staff Change and Rest, Clinical Corridor. Twelve named rooms, 3,170 sq ft, about 898 cubic metres, all of it getting nothing. A category gets reinterpreted by a well-meaning housekeeping supervisor in month seven who thinks the recovery bay looks bare. A list of named rooms on a drawing does not.
A reason beside each name. One short line, in ordinary language, saying why that room is on the list. This is not bureaucracy; it is what makes the list survive a change of staff, because the next person to read it understands the logic rather than inheriting a rule. Two ordinary facts are reasons enough for several of these rooms and I will state them plainly and then leave them alone. Nausea after anaesthesia is ordinary and widely known, and recovery is where people experience it - reason enough for both recovery areas to be fragrance-free, and this page says nothing at all about a fragrance helping, relieving, worsening or causing it, because there is no such claim to make. And a patient in pre-op has been fasting since the previous night, is changed, and is waiting to be called; that person is not in a state to be presented with an ambient anything, which is an aesthetic and ethical judgement rather than a clinical one and is sufficient on its own.
Signed by the clinical lead and the infection-control lead. Not circulated for comment. Signed. And brought into the process at step one rather than shown a finished scheme at step seven, because a boundary those two people helped draw is a boundary they will defend when an enthusiastic supplier arrives in year two, and a boundary handed to them is a document nobody owns. They may extend the list and frequently should. Nobody may shorten it. And if they decide that the public half should be unscented too, or that the whole idea is inappropriate for this facility, that is a complete and legitimate answer that overrides every recommendation on this page.
Marked on the same drawing as the scenting plan. One sheet, both things, so the two documents can never disagree and so the person holding the drawing can see the boundary and the machine position at the same time.
And the boundary goes at the last real DOOR. This is the sentence to take into the design meeting. A door - a leaf that closes, in a building whose air handling agrees with it. A curtain is not an air boundary. It is a visual screen and air moves around it freely. An archway is not an air boundary. It is an opening with a nicer profile. A screen is not an air boundary. A sign reading "clinical area - authorised personnel only" is emphatically not an air boundary; it governs people, and air cannot read. If the last thing between your scented public circulation and your clinical zone is an opening rather than a closing leaf, your real boundary is wherever the next closing door is, and every room in between belongs on the fragrance-free list even if it looks and feels public.
Sites and architects find that uncomfortable, because it almost always moves the boundary outward and shrinks the area you can scent. Good. That discomfort is the building telling you the truth, and at design stage you can respond to it by adding a door - which is a cheap, ordinary architectural move that recovers a large amount of scentable volume and improves the building for several other reasons at the same time. That is the single best thing this page can do for somebody at your stage: if you want the premium patient lounge on the scented side, put a real door between it and the clinical corridor, now, while a door costs what a door costs.
And note what the boundary does to the numbers, because it is the whole commercial story of this bank. Draw it honestly on this plan and your scented volume is 823 cubic metres out of 2,031 - about 41 per cent of the building's air. That is not a disappointing result. It is the correct result, arriving early enough to size against.
You now know which doors close, so you know what your connected volumes actually are. On this plan there are two public volumes rather than one: the main connected body at 823 cubic metres - lobby, reception and billing, consultation waiting, the attendant lounge and the public circulation, all open to each other - and the premium patient lounge behind its door at 68 cubic metres. Plus five consultation rooms at about 38 cubic metres each, which get nothing of their own, and public washrooms at 51 cubic metres, which are extracted and never scented.
Size against 823, not against 6,500 sq ft and not against 2,210 cubic metres. Do the arithmetic by hand every time: floor area multiplied by ceiling height gives cubic feet, and cubic feet divided by 35.3 gives cubic metres, and state the ceiling assumption out loud because in a hospital it varies by room. The 18 ft entrance alone is 9,360 cubic feet, about 265 cubic metres, which is nearly a third of the whole connected body in a single room and is the reason a double-height lobby is the hardest place in the building to hold a register and the easiest place to over-dose. What you are actually dosing when you turn the entrance up is everything behind it.
Then the lounges, which are the rooms with real dwell. The attendant and family lounge at 211 cubic metres is the most legitimately scented room in a day-care hospital: somebody sits there three to five hours with nothing to do, is not fasting, has no procedure ahead of them and can walk out whenever they like, so the air and the seating are very nearly their whole experience of your facility. Set that room for the person at hour four rather than the person at minute three. The premium patient lounge at 68 cubic metres takes the same register at a clearly lower level, or nothing - it is smaller, enclosed, and it often holds somebody already on the clinical pathway who cannot leave without missing their call. A costlier room is never dosed higher because it cost more.
Step six: the signature. One register, chosen once, held for years. That is it. A signature is a repetition rather than a smell: the attendant who waited four hours in March and comes back in September meets identical air and files your hospital as one carefully run thing without ever consciously noticing. Consistency makes a signature, not uniqueness. Bespoke composition is a real SOSA service and is discussed on WhatsApp rather than priced on a page, but the honest cheaper answer comes first: one of the seven Hotel Collection registers from ₹299, never changed, already is a signature. Write the register and the setting on a dated card taped to the machine, because a level that is not written down is not a setting - it is somebody's memory, and memories drift upward as noses adapt.
Step seven: machine placement, last. Every rule here is a consequence of something earlier on the page.
Inside the volume you intend to scent, facing into it. Not in the room next door, not in the lobby hoping it reaches the lounge.
Out of the supply throw. A unit standing under or in front of a supply diffuser stops being a room diffuser and becomes an injector: the emission is caught at the point of highest air velocity in the room and carried, at pace, wherever that air was going. The same machine moved four metres sideways is a different building.
Away from the return grille. A unit near a return is being extracted almost as fast as it emits, which is why one lobby smells of nothing at a setting that over-scents another.
Never in the connecting corridor. A corridor between the public and clinical halves is very often doing service as a return path, which makes it a piece of air-handling equipment rather than a piece of architecture. A machine in there is not scenting a corridor; it is dosing a duct. Corridors are also where machines end up by default, because a corridor is where the spare socket is.
Never ducted into or placed in air handling that serves a clinical zone. Absolutely, at any price, in any building.
On a live socket, with no cable crossing a wheelchair or trolley route. The Vaayu runs on DC 12V / 1A at 5W and is mains powered, so it needs a live supply wherever it stands, and it lays flat freestanding or mounts on a wall. Specify that socket now, in the right place, while it is a line on an electrical drawing. Every badly placed scent machine I have found in a hospital was standing where the socket was, and a trailing cable in a building full of wheelchairs and trolleys is a worse problem than a badly scented lobby.
On a timer that follows OPD hours. The Vaayu has a Bluetooth app and timer. The lobby should be right when the first list arrives at seven and the machine should not be quietly running at three in the morning into a closed building, because a shut building holding a night of accumulated fragrance is exactly the stale first impression this whole sequence was designed to avoid.
And then commission it like a system rather than switching it on: set low, write the card, leave it a fortnight, judge it from the doorway on a Monday morning into a building that has been shut since Saturday, ask three people who have just come in off the street what they notice before telling them a diffuser exists. Then walk the boundary with the doors in their normal state and ask at each one whether anything is detectable on the clinical side. If it is, the answer is to move the machine and then ask your engineer why that path exists - never to change the fragrance.
- Separate the air handling for the public and clinical halves, supply and return.
- Specify extraction, then design where waste is held, how often it leaves, by what route.
- Sign the fragrance-free list as named rooms, with the boundary at the last real door.
- Size by connected public volume, hold one register, and place the machine last.
The signature, the registers, and the machine that goes in last
The register, then - step six, and the most enjoyable ten minutes in the whole sequence, which is why it has to be kept in its place. There are seven in the water-based Hotel Collection, each SOSA's own hotel-inspired interpretation, and SOSA is independent and not affiliated with, endorsed by or connected to any hotel brand - which I would rather say plainly in a healthcare building than trade on somebody else's name.
For a premium day-care hospital the steer is narrower than for any other commercial vertical and it is a context steer rather than a taste one: clean and unsweet reads right. A heavy, sweet or plush character in a clinical building does something specific and unhelpful - it reads as covering something, because sweetness over a warm enclosed room is what covering usually smells like in ordinary life. In a restaurant that same warmth reads as generosity. In a hospital lobby, where a family has already passed a sanitiser station and caught a trace of disinfectant and arrived slightly braced, it answers a question they had not yet asked, in the wrong direction.
White Tea Serenity - white tea, aloe and cedar - is clean, weightless and spa-like, and it is the register that reads most naturally as clean rather than as scented, which is the exact distinction this entire building is making. Quiet Luxury - white tea, bergamot and cedar - is hushed and polished, the same idea with a little more finish, and it is the default for a premium new build with no strong view. Forest Suite - cedarwood, vetiver and green leaves - is grounding and biophilic green, holds its structure better than anything else in the collection when run low, and is the right answer for a purpose-built hospital with timber, stone or real planting in the lobby, which a new premium facility very often has.
Tea Garden - jasmine, green tea and white tea - is the least risky floral because the jasmine sits inside the tea rather than on top of it, and it suits a warmer family-facing facility, though it runs a step warmer and wants a lower number. Warm Welcome - citrus, floral and sandalwood - is a genuine threshold register, and in a double-height 265 cubic metre entrance it is the one most likely to tempt somebody into turning it up. Old-World Glamour - amber, violet and woods - is plush and evening-elegant and is the wrong shape for this building for the covering reason above. Lobby Bar - citrus, pepper and amber - is bold, playful and after-dark, and it has no home in a day-care hospital at all, at any setting.
One design-stage fact that belongs here and is a product fact rather than a claim. The two SOSA systems work differently: the ultrasonics - Boond ₹899, Sukoon ₹1,899, Megh ₹3,499 - are cool-mist machines that add moisture to the air because that is their mechanism, while the Vaayu at ₹11,999 is waterless cold-air nebulising of undiluted oil, so no water, no humidity and no wet residue. State both to your facilities and clinical leads and let them weigh it; in a facility with a surgical zone the waterless property is very often the one that gets a machine accepted at all. No SOSA product dries, dehumidifies or treats damp, and none is an air-treatment device of any kind.
And the honest hierarchy that closes the register question: register is taste; level, zone and placement are what go wrong. I have never walked into a hospital and thought the problem was cedar instead of white tea. I have walked into a great many where the character was perfectly sensible, the level was set for a thirty-second walk-through, and the machine was standing in a corridor it should never have gone near. Spend ten minutes here and the next month on the other three.
What I will not do is rank the seven against each other on measured throw or longevity - SOSA does not publish that comparison, and your connected volume, ceiling heights, ventilation, door traffic, soft furnishing and setting swamp any inherent difference between blends.
And the rooms that get no register at all, on this plan and in any facility: pre-op and admission bays, both procedure rooms, minor procedure, first- and second-stage recovery, sterile and decontamination, clinical and drug storage, clinical waste holding, the clinical pantry, staff change and the clinical corridor. Not a lower setting. Nothing.
| Scent | Why it suits the mood |
|---|---|
| The connected public body · about 823 cubic metres | Entrance lobby 520 sq ft at 18 ft (9,360 cubic feet), reception and billing 420 at 12 (5,040), consultation waiting 380 at 12 (4,560), attendant lounge 620 at 12 (7,440) and public circulation 220 at 12 (2,640). One register, one level, set for the person at hour four. One Vaayu at Rs 11,999 covers it with margin - and margin means run it lower, not spend it elsewhere. |
| The premium patient lounge · about 68 cubic metres, behind a door | 240 sq ft at 10 ft is 2,400 cubic feet - a separate volume because its door stays shut, which is exactly why the door is worth having. Same register, clearly lower level, or nothing at all if it is the last room before the clinical corridor. Never dosed higher because the room cost more to build; premium is a reason to do less to the air, not more. |
| Extracted, never scented · washrooms, pantries, waste holding | Public washrooms 180 sq ft at 10 ft, about 51 cubic metres. Clinical waste holding 100 sq ft at 10 ft, about 28 cubic metres, enclosed, extracted, away from public circulation, with a removal frequency and an exit route designed rather than inherited. These rooms are answered by extraction and operations. Fragrance adds scent and cannot remove odour from any of them. |
| Nothing at all · 3,170 sq ft, about 898 cubic metres | Pre-op and admission bays, procedure rooms A and B, minor procedure, first- and second-stage recovery, sterile and decontamination, clinical and drug storage, clinical waste holding, clinical pantry, staff change and rest, clinical corridor. Twelve named rooms on the drawing, a reason beside each, signed by the clinical and infection-control leads. Not a lower setting - nothing. |
So what you actually buy at the end of a sequence done properly, for a 6,500 sq ft premium day-care hospital. One SOSA Vaayu at ₹11,999 for the 823 cubic metre connected public body: waterless cold-air nebulising of undiluted oil, so no water, no humidity and no wet residue anywhere in a building with a surgical zone; approximately 1000 cubic metres of connected air, with SOSA's own copy also stating 2,000 to 3,000 sq ft scented evenly; a 400ml tank; freestanding, wall or HVAC mount; DC 12V / 1A at 5W and mains powered, which is why the socket is on the electrical drawing; CE, RoHS and SGS; and a Bluetooth app and timer so it runs your OPD hours and nothing else. It is an ambient fragrance product for public areas. It is not a medical device, not an infection-control or air-treatment device, and it is not validated for clinical use: it adds scent rather than removing odour, and it cannot travel through a closed door.
Then either nothing at all in the 68 cubic metre premium patient lounge, which is my recommendation on this plan, or - if your clinical leads are comfortable and the lounge sits two doors back from the clinical corridor - a SOSA Boond at ₹899 on a low setting, because a small machine in a small room is a far better arrangement than a large machine turned down. If your front of house turns out to be several separate rooms rather than one connected body, the Vaayu is the wrong purchase and the answer is a SOSA Sukoon at ₹1,899 in the room that matters, running the water-based Hotel Collection from ₹299 with 100ml refills at ₹999, and nothing in the others. A SOSA Megh at ₹3,499 with its 6 litre tank suits a 211 cubic metre attendant lounge that runs from seven in the morning to eight at night. The pack of seven 15ml bottles at ₹1,799 is how you choose a register in your own finished lobby air rather than from a description, judged on day five rather than on the first afternoon.
If what a quiet reception desk wants is no plug, no noise and nothing to switch off, the SOSA reed diffusers are their own registers rather than Hotel Collection ones: Morning Freshness at ₹749 in Malabar lemon, mint and eucalyptus is the most obviously clean-reading, Mountain Breeze at ₹849 in Himalayan pine, sage and cedar sits closest to a hospital's woody direction, Garden Bloom at ₹799 and Evening Calm at ₹799 are the softer pair, and Fresh Brew at ₹849 is a lovely thing in a home and the wrong shape for a hospital desk. The 130ml is from ₹1,249, refills are ₹2,399 at 300ml and ₹3,499 at 500ml, and a reed lasts about 6 to 10 weeks.
Two systems and they are not interchangeable: the ₹299 water-based bottle never goes into a Vaayu or into an HVAC machine. The ducted machines - Aangan at ₹25,999 for approximately 8,000 to 10,000 sq ft and Meenar at ₹38,500 for approximately 12,000 to 18,000 sq ft - are an engineering conversation with your own HVAC consultant about air handling that serves the public half exclusively, and are never ducted into air handling that serves a clinical zone.
Three sibling pages go deeper on parts this one covers in a paragraph. The air-handling mechanisms in full, with a worked 5,000 sq ft plan, are in stopping reception fragrance travelling through the HVAC into clinical areas. The level relationship between a premium patient lounge and an attendant waiting area is in the same signature fragrance or one neutral page. And if this is one of several sites, what a head office may and may not standardise is in standardising the arrival experience across a multi-location day-surgery brand.
What SOSA does not publish, and what this page will therefore not invent: consumption rate, refill frequency, monthly running cost, machine lifespan, minimum order quantity or installation lead time. Send the drawings, the ceiling heights, the air-handling arrangement and the signed fragrance-free zone list to WhatsApp +91 96192 18531 and you will get an honest answer about whether this is one machine, two or none. Bulk orders are welcome, custom label or logo on product is available, and bespoke composition made only for your brand is a real SOSA service discussed there rather than priced on a page - though the cheaper honest answer comes first, which is that one of the seven registers held consistently already is a signature.
And that is the end of this bank, so let me finish on the line it has been earning for a hundred pages. Everything above is a sequence for building a hospital whose public half can carry an identity because its clinical half was separated on purpose - in the air handling, on the drawing, and in the signatures of the people accountable for it. The boundary is the product, not the machine.
The SOSA scenting range
SOSA sells two different systems and one of the commonest mistakes is mixing them up. Size by the connected air volume of the room you are actually scenting - which in a day-care hospital is almost always the entrance, reception, billing and attendant lounge alone - floor area multiplied by ceiling height gives cubic feet, and cubic feet divided by 35.3 gives cubic metres. A door that stays shut ends one volume and begins another.
| Machine | System | What it is for | Price |
|---|---|---|---|
| SOSA Boond | Ultrasonic · water-based | A small desk or corner unit for one enclosed room - runs the water-based Hotel Collection | ₹899 |
| SOSA Sukoon | Ultrasonic · water-based | A larger ultrasonic for a reception or consultation room - Hotel Collection from ₹299 | ₹1,899 |
| SOSA Megh | Ultrasonic · 6L tank | A large-tank ultrasonic for a bigger lounge that runs all day | ₹3,499 |
| SOSA Vaayu | Waterless cold-air nebulising | The commercial machine - approx 1000 m3 of connected air, Bluetooth app and timer, no water and no humidity | ₹11,999 |
| SOSA Aangan | HVAC nebulising | Ducted scenting for approximately 8,000 to 10,000 sq ft | ₹25,999 |
| SOSA Meenar | HVAC nebulising | Ducted scenting for approximately 12,000 to 18,000 sq ft | ₹38,500 |
Two systems, and they are not interchangeable. The ultrasonics - Boond, Sukoon and Megh - run the water-based Hotel Collection from ₹299. Vaayu and the HVAC machines run waterless nebulising oil; the ₹299 water-based bottle never goes into a Vaayu. SOSA blends are SOSA's own hotel-inspired interpretations and SOSA is independent and not affiliated with any hotel brand. A portion of every order supports girl-child education through Nanhi Kali.
- Vaayu ₹11,999 - waterless cold-air nebulising, approx 1000 m3 connected air, Bluetooth app and timer, 400ml tank, freestanding or wall / HVAC mount, DC 12V / 1A, 5W, mains powered, CE / RoHS / SGS.
- Aangan ₹25,999 for approximately 8,000 to 10,000 sq ft and Meenar ₹38,500 for approximately 12,000 to 18,000 sq ft - both ducted into HVAC.
- The ultrasonics - Boond ₹899, Sukoon ₹1,899, Megh ₹3,499 - run the water-based Hotel Collection from ₹299, with 100ml refills at ₹999.
- Not published, and therefore never stated on this page: consumption rate, refill frequency, monthly running cost, machine lifespan, installation lead time or any minimum order. Those go to WhatsApp +91 96192 18531.
Versailles
A day-care hospital is the most careful room I write about, and I want to be plain about why. Somebody walks in at seven in the morning to have a procedure. Their mother or their husband sits in your lounge for four hours with nothing to do but look at the walls and worry. And a few metres away, behind doors that should stay shut, there is a zone where none of this belongs at all.
So the answer here is not a stronger machine or a cleverer scent. It is a boundary. Entrance, reception, billing and the attendant lounge are the public half of your building and they are allowed to feel like somewhere that was thought about. Pre-op, procedure, recovery and everything clinical are the other half, and the honest answer for all of it is nothing. Not less. Nothing.
Two things I say to every facility that asks. Fragrance adds scent - it never subtracts one, so it cannot cover disinfectant, and a scent laid over disinfectant makes a third smell that reads worse than either. And the decision is not mine or yours alone: what is introduced into the air of a building with a surgical zone belongs to your clinical leads, your infection-control team and your engineers. I would rather lose the sale than have a page of mine used to argue past them.
Frequently asked questions
Facts verified September 2026: SOSA Vaayu ₹11,999 is a waterless cold-air nebulising diffuser rated for approximately 1000 m3 of connected air, with Bluetooth app and timer, a 400ml tank, freestanding or wall / HVAC mounting and a DC 12V / 1A, 5W mains supply. SOSA Aangan ₹25,999 covers approximately 8,000 to 10,000 sq ft and SOSA Meenar ₹38,500 approximately 12,000 to 18,000 sq ft, both ducted into HVAC. The ultrasonic machines - Boond ₹899, Sukoon ₹1,899 and Megh ₹3,499 - run the water-based Hotel Collection fragrance from ₹299, with 100ml refills at ₹999; that water-based bottle is not used in a Vaayu or an HVAC machine. Reed diffusers start at ₹749 and last roughly 6-10 weeks. A coverage rating assumes one connected body of air; scent does not travel through a closed door. Ambient scent research supports improved evaluations of a space and its service, longer dwell and stronger recall at moderate effect sizes - it does not support claims about bookings, fees or retention. Fragrance adds scent and does not remove, neutralise or purify odour, and no SOSA product makes any health, antibacterial or air-purifying claim. No SOSA product is a medical device, a clinical product, an infection-control product or an air-treatment device, and none is validated for use in a clinical environment. Nothing in this guide is clinical, infection-control or engineering advice: in a facility with a surgical or procedural zone, what may be introduced into the air is governed by the operator's own clinical leadership, infection-control policy and facilities engineering, and their decision overrides every recommendation here. SOSA blends are SOSA's own hotel-inspired interpretations; SOSA is independent and not affiliated with any hotel brand. Prices and availability are subject to change - see the live product pages.