Pass one, doors: mark every doorway and note whether the door is genuinely closed at a busy hour. A closed door is a real boundary. An opening with no door merges two rooms into one volume however irregular the shape, and one volume holds one concentration.
Pass two, air: get the HVAC drawing out and mark which spaces each AHU actually serves, then mark the lift shafts and open stairs, which behave as chimneys. Spaces on one air path behave as one zone even when a wall suggests otherwise.
Pass three and four, height and hours: write the ceiling height on every space, because coverage is rated in volume and a double-height hall eats coverage a square-foot figure hides. Then write the genuinely occupied hours, because a space used two evenings a week is a scheduling problem rather than an intensity one.
The honest gap: this page gives you the reasoning and deliberately does not give you a machine count, because a formula per square foot would be invented. Vaayu ₹11,999 is rated to up to 1000 m³ and Aangan ₹25,999 to up to 3,000 m³ on HVAC; the count follows from your marked plan, and no purchasable refill oil is listed for the waterless machines — that fragrance is specified and quoted per property through the contact page.
2. Make four marks, in this order: doors, air, height, hours. Mark every doorway and whether the door is genuinely shut at that hour. Mark, from the HVAC drawing and confirmed on the walk, which spaces each air handling unit serves, and mark the lift shafts and open stairs. Write the ceiling height on every space. Write the hours each space is genuinely occupied, not the hours it is theoretically available. Those four marks contain the entire answer; everything after this is bookkeeping.
3. Group the spaces into zones, and mark the silences in the same pass. Spaces that share air with no door between them are one zone even if they have three names. Spaces separated by a door that is reliably shut are separate zones even if they are small. Spaces on the same AHU path behave as one system whatever the walls do. Then, on the same sheet and in ink, mark the spaces that get nothing at all: dining, private dining and the bar counter, the gym floor, spa treatment rooms, boardrooms and private meeting rooms, and a heritage library or card room.
4. Set a falling intensity along the member’s actual route, not around the plan. Trace the path a member walks from the car park inwards and number the zones in that order. Arrival takes the highest setting, because it is the one volume nobody occupies long enough to adapt to. Circulation sits below it and runs continuously. Seated zones sit lowest of all, set for the fourth hour of a long afternoon rather than the first minute. The step between consecutive zones is what a member actually perceives, so the gradient is the design and the absolute numbers matter far less than their order.
5. Only now specify hardware — and get a count from your plan, not from a rule of thumb. Vaayu ₹11,999 is the zone unit at up to 1000 m³; Aangan ₹25,999 is the air-system unit at up to 3,000 m³ when it is connected into the HVAC. Both are waterless cold-air nebulisers: undiluted oil shattered into a dry nano-mist, no water, no dilution, no added humidity, no residue. Alcohol-free, phthalate-free, IFRA-compliant, composed in Pune, and a portion of every order supports girl-child education through Nanhi Kali.
The four marking passes over the floor plan
Do these as four separate walks rather than one. It sounds inefficient and it is not, because each pass asks a different kind of question and mixing them produces a plan covered in marks that nobody can read a fortnight later. Use a different colour for each pass if that helps. What you are building is a single sheet that any specifier — ours or anybody else’s — can read without visiting your building, and that sheet is worth more to you than any quotation, because it is the thing that lets you compare quotations honestly.
One preliminary, and it is not a delay tactic even though it delays the sale. Do this survey on a building whose air is already in order. If the club smells stale in the morning, if the card room has a closed sour note in monsoon, if the carpets have taken up a season’s humidity, then a zoning plan is premature — fragrance laid over a stale building does not produce fragrance, it produces the building plus fragrance, and that mixture reads as cheaper than the original problem because it now smells like a cover-up. Find the source, deal with the moisture, get the air changing, clean the absorbent surfaces, and then survey. A club that runs its air handling on fresh air before opening, dries its carpets properly and services its drain traps so they do not go dry overnight will smell better before a single machine is specified, and its zoning survey will also be accurate rather than a description of a problem. SOSA sells no air purifier and no dehumidifier, and a diffuser makes no air-quality claim of any kind: fragrance adds fragrance, which is the whole of it.
Vaayu₹11,999Go round every threshold in the property and record one of three things: closed door, door held open, or no door at all. That distinction is not administrative — it is the difference between two zones and one. Fragrance moves only in air, so a closed door genuinely stops it and an opening genuinely does not. Two modest rooms with a shut door between them will hold two different levels indefinitely. A lobby that widens into a lounge through a wide cased opening is one volume with one concentration, and no equipment changes that.The interesting mark is the middle one. Almost every club has doors that exist on the drawing and are wedged open all day — by a steward with a tray, by a housekeeping trolley, by a door closer that was disconnected years ago. Those doorways are openings, not boundaries, and they must be marked as openings. You then have a choice that costs nothing: either accept the merged volume and zone accordingly, or restore the door as a piece of operational discipline and gain a real boundary for the price of a conversation. Clubs consistently underestimate how much zoning capacity they already own and have simply propped open.
Aangan₹25,999This is the pass most clubs skip and the one that changes the answer most. Get the mechanical drawing, sit down with whoever maintains the plant, and shade the plan by air handling unit: this AHU serves the lobby, the corridor and the lounge; that one serves the first floor; the banquet hall is on its own; the gym has a separate system. Then confirm it on foot, because mechanical drawings and buildings diverge over twenty years of alterations. What you are producing is a map of where air actually goes, and air is what carries fragrance.Two consequences follow immediately. First, spaces served by one AHU behave as a connected system even where walls suggest otherwise — which is precisely the condition under which a single Aangan connected into that unit is the elegant answer rather than four separate machines. Second, mark the lift shafts and open staircases, which behave as chimneys: warm air rises through them and delivers your ground-floor fragrance to a first-floor landing you never intended to scent. While you are there, note the rate at which each zone exchanges air, because it decides how the same machine behaves in two places. A high-air-change space carries fragrance away as fast as it arrives and needs continuous replacement; a relatively sealed space accumulates. Air conditioning does both jobs at once — it distributes a fragrance evenly through a volume and it removes it faster than a still room would.
Mountain Breeze₹849Height first. Published coverage for commercial machines is stated in cubic metres rather than square feet, and that is not pedantry — it is the only honest unit. A double-height entrance hall, a galleried stair or a banqueting room with a nine-metre ceiling consumes coverage that a floor-area figure hides completely, and the club that sizes on square feet will under-specify its grandest room and wonder why the one space it most wanted to work is the one that does not. Writing a height on every space takes twenty minutes and removes the single commonest sizing error in this trade.Then hours. Write what is true, not what the room booking system says. A card room used two evenings a week, a banquet hall used eleven times a year, a coworking floor occupied from nine to seven, a lobby that is busy for forty minutes twice a day: these are different problems, and most of them are scheduling problems rather than intensity problems. A space used intermittently does not want a higher setting, it wants a schedule that brings it up before it is used and lets it fall away afterwards. This is also the pass in which you mark the silences — dining, private dining and the bar counter, the gym floor, spa treatment rooms, boardrooms and private meeting rooms, and a heritage library whose smell of paper and timber is an asset rather than a defect.
Grouping the marks into zones, and setting the gradient
Now sit down with the marked plan and draw the zone lines. The rule is mechanical and you should resist the urge to improve on it: a zone is a set of spaces that share air with no reliable boundary between them. Start at the entrance and work inwards. Where you meet a genuinely closed door, draw a line. Where you meet an opening with no door, do not draw a line however different the two rooms look. Where two spaces sit on one AHU path, treat them as one system even if there is a door, because the air handling will equalise them over the course of a day. What emerges is usually fewer zones than the club expected and more than a single machine can serve, which is precisely the useful answer.
Then number the zones along the member’s route rather than around the plan, and assign the gradient in that order. Arrival takes the highest setting: a threshold is crossed in seconds by somebody who has just come in from outside with an unadapted nose, so it is the one volume in the club that can be plainly perceptible without anybody finding it intrusive. Circulation — corridors, stair halls, lift lobbies — sits below arrival and runs continuously, and it is frequently the best value in the whole scheme, because it supplies the perceptible step into every room that opens off it while costing one machine. Seated zones sit lowest, dosed for the fourth hour of a long afternoon rather than for the first minute. Where you have marked a silence, write unscented on the zone rather than leaving it blank, because a blank invites somebody to fill it in later.
A note on the zone that most clubs get wrong at this stage, which is the one with the most bodies in it. A busy networking floor or a full lounge is not a room that needs more fragrance because there is more air to fill; it is a room that needs less. Forty people in a lounge are forty sources of their own fragrance, and senior members in particular tend to be wearing something they chose deliberately. A house fragrance at a confident setting does not join that; it competes with it, and the member who notices the competition is the member whose own perfume is being interfered with. Density is therefore an argument for the bottom of your gradient, not the top. Mark heavy-occupancy spaces on the plan as such, and set them a step below what the volume alone would suggest.
One caution about how you validate all this, because it is where good schemes are undone. You cannot judge a zone you are standing in. The nose reports change rather than constancy, so within a short time of entering a space you stop registering its fragrance while it is still physically arriving — which means the general manager who has walked the club all morning is the least reliable instrument in the building, and is usually the person holding the dial. The only valid test is to leave, spend long enough outside for the nose to reset, and walk the whole route back in as a member does, in order, without stopping. Do it with a member if you can. Then write the settings down. A zoned scheme only becomes a system when it exists on paper: fragrance, machine position, intensity per zone, schedule per zone, refill cadence, the unscented list, and one named person who owns all of it. Until that sheet exists you do not have a scheme, you have some machines.
The marked-up plan, space by space
This is what the finished survey looks like when it is transcribed into a table a house committee can read. Note what the last column does not contain: a machine count. It contains the reasoning that produces one, which is the part you can check and argue with.
| Space | Doors | Air path and height | Occupied hours | Zone and level |
|---|---|---|---|---|
| Vestibule and entrance ★ | Doors both sides — a real boundary | Often its own small volume; note if double-height | Seconds per member, all opening hours | Zone 1 — the signal, clearly perceptible |
| Main lobby and reception | Usually open to the lobby — not a separate zone | Frequently double-height; write the height down | Busy in bursts, empty between | Zone 1 or 2 — one step below the vestibule |
| Corridors, stair halls, lift lobbies | Open to everything by definition | Shares air widely; lifts and stairs act as chimneys | Passed through constantly | Zone 2 — light, continuous, best value in the scheme |
| Members’ lounge | A zone only if doors exist and are shut | Usually on the main AHU with the lobby | Two to four hours, seated | Zone 3 — below the level anyone would name |
| Coworking or business floor | Often open plan across a whole floor | One AHU, standard height, many bodies | Nine to seven, long dwell | Zone 3 — lounge rules, not lobby rules |
| Cloakrooms and washrooms | Small, door-separated, self-contained | Extract ventilation, low volume | Minutes at a time | Zone 4 — reeds are genuinely right at this scale |
| Dining, private dining, bar counter | Irrelevant — marked as a silence regardless | Kitchen extract dominates the air here anyway | An hour or more, eating | Unscented, in ink |
| Gym floor and spa treatment rooms | Usually a separate air system — confirm it | Needs air change rather than fragrance | Thirty to ninety minutes | Unscented; scent the wellness reception lightly instead |
| Boardrooms, meeting rooms, heritage library | Door-separated, which makes the silence easy to hold | Small closed volumes; fragrance accumulates in them | One to three hours, captive | Unscented; the corridor outside carries the identity |
A bounded zone · Vaayu₹11,999See it → One AHU, several spaces · Aangan₹25,999See it → Larger property · Meenar₹38,500See it →
Specifying the hardware last, and why no count is published
With the survey in hand the mechanism choice becomes almost self-evident, because each zone has already told you what it needs. A reed diffuser is a passive capillary device: oil climbs six fibre reeds and evaporates, with no energy used and no air moved, producing a fragrant zone of roughly a couple of metres rather than a fragranced room. Wherever your survey wrote “small, door-separated, minutes at a time” — a cloakroom, a console in a secretary’s office — that is the correct specification and a machine would be waste. Wherever it wrote “4,000 sq ft, open plan, seated”, reeds are not underperforming, they are doing what a passive device does, and nine more bottles produce nine more small hills with valleys between them. An ultrasonic machine — Sukoon ₹1,899 at 270–320 sq ft, Boond ₹899 at up to about 150 sq ft — covers a real small room but dilutes the oil in water, adds humidity and can leave a fine white mineral deposit on dark joinery. In most Indian clubs humidity is on the list of problems rather than on the list of tools.
For anything your survey calls a zone, waterless cold-air nebulising is the answer. Pressurised air shatters undiluted oil into a dry nano-mist that the room’s own airflow distributes: no water, no dilution, no added humidity, no residue. Vaayu at ₹11,999 is the zone unit, rated to up to 1000 m³, with a Bluetooth app and onboard buttons, run windows of 1h, 4h, 8h or 24h, day selection, adjustable intensity, auto-stop and a key-lock, under 38 dB, on DC 12V / 1A at 5W, carrying CE, RoHS and SGS, in black or white. Aangan at ₹25,999 is the air-system unit, rated to up to 3,000 m³ ≈ 8,000–10,000 sq ft when connected into the HVAC or AHU, with an 800ml reservoir, under 42 dB, DC 12V at 14W, a metal body of 3.9 kg at 284 × 125 × 246 mm, one-year warranty, imported, and control by an intelligent PCB with programmable work and pause cycles and daily schedules — a board rather than a phone, with no app and no Bluetooth of its own. Meenar at ₹38,500 is the larger-property option, specified on enquiry.
Now the question every general manager wants answered in a single number, and the reason I will not give you one. No machine count per square foot is published here, because an honest one does not exist. Two clubs of identical floor area can need entirely different schemes: 20,000 sq ft on a single air system with few internal doors is one problem, and 20,000 sq ft over four floors with lifts, open stairs and five air handling units is a different problem in which the real question is where air goes. The count follows from your four marks — connected volume, ceiling height, door positions, air paths, occupied hours — and from nothing else. Any supplier who names a number before seeing that plan is guessing, and you should take the guess as information about the supplier rather than about your building. Send the marked-up plan to the contact page and the reply can be specific. One related note belongs in the same paragraph: no purchasable refill oil is listed for the waterless commercial machines. The fragrance for them is specified and quoted per property, which in commercial scenting is the normal arrangement rather than an evasion, and for a zoned club it is also the sensible one, because the fragrance has to hold its outline at the lowest of your settings and not merely at the highest.
The method in order — and the two gaps
If a club asked me to write this as a procedure rather than an essay, here it is, with costs attached honestly. The first four lines buy nothing and decide everything. The last row is the pair of things this range does not contain, which belong in the table rather than in a footnote a committee discovers afterwards.
| Step | What it is | Why it comes here in the order | Cost |
|---|---|---|---|
| 1. Fix the building before you survey it ★ | Moisture, air change, drain traps, carpet drying, a fresh-air purge before opening | Because fragrance laid over a stale building reads as a cover-up, and members name it as one | No purchase |
| 2. Four marking passes with a printed plan | Doors and openings · what each AHU serves, plus lifts and stairs · ceiling height per space · genuinely occupied hours per space | These four marks contain the whole answer; everything after them is arithmetic | No purchase |
| 3. Group into zones and mark the silences in ink | Shared air with no reliable boundary equals one zone; dining, gym floor, spa treatment, boardrooms and the library are written unscented | Naming the exclusions on the same drawing is what makes the scented zones credible to the chef and to the membership | No purchase |
| 4. Write the gradient along the member’s route | Arrival highest, circulation lower and continuous, seated zones lowest, each with a schedule | The step between consecutive zones is what members perceive, so the order matters more than the absolute settings | No purchase |
| 5. Vaayu per bounded zone, key-locked | Up to 1000 m³, in the airflow path or an HVAC return, DC 12V low-voltage point, set once and locked | The first zone to equip is arrival; after that, follow the plan rather than the budget | ₹11,999 |
| 6. Aangan where pass two found one AHU serving several zones | Up to 3,000 m³ on HVAC, 800ml reservoir, programmable work and pause cycles and daily schedules | It is the right instrument only where the air handling genuinely reaches the spaces you marked — confirm before specifying | ₹25,999 |
| No machine-count formula, and no listed commercial refill: the honest gaps | SOSA publishes no machines-per-square-foot rule, because the number depends on volume, doors, air paths and occupied hours. No purchasable refill oil is listed for the waterless commercial machines either — that fragrance is specified and quoted per property | Said plainly, because a committee will test both, and because a survey-based number is the only kind worth having | Quoted |
Versailles
I have done this walk in a good many buildings now, and the pass that changes the answer is almost always the second one. A general manager will hand me a beautiful floor plan with eleven rooms neatly labelled, and forty minutes later we will have discovered that six of those rooms are on one air handling unit, that the door between the lounge and the lobby has not closed since a refurbishment in another decade, and that the open stair in the middle of the plan has been quietly delivering the ground floor’s air to the first-floor landing for years. None of that is on the drawing. All of it decides the scheme.
The second thing I would say is about the fourth pass, the hours, because it is the one clubs are most tempted to skip. A club is not occupied the way a hotel is. It has rooms that are full for two hours a week and rooms that are full for ten hours a day, and treating them alike is how a card room ends up with a machine in it and a corridor ends up with nothing. Most of what a general manager wants from a scenting scheme — consistency, no peaks, no complaints, no waste — is delivered by schedules rather than by intensity, and you cannot write a schedule you have not surveyed.
Finally, a word about what happens after commissioning, because the survey is only half the work. Write the result down on one sheet: the fragrance, each zone’s machine position, each zone’s intensity, each zone’s schedule, the refill cadence, the unscented list, and the name of the one person who owns all of it. Then turn the key-locks. Every zone in a club contains a member of staff who has spent the whole shift inside it, has stopped registering it entirely, and honestly believes theirs is the weak one; if three of them adjust three machines over a season, the gradient you surveyed for is gone. Check it the only way it can be checked, which is by leaving the building, coming back in through the front door and walking the route in order, ideally beside a member who has been elsewhere all day. Everything we make is composed in Pune, and a part of every order funds a girl’s classroom through Nanhi Kali.
Frequently asked questions
- Should every area smell the same — the pillar: why one identity at several intensities beats both uniformity and variety.
- Lobby against lounge and one identity, many intensities — the gradient itself, in detail.
- Corridors — the connective tissue, and frequently the best place to spend the budget.
- Meeting rooms and the library — two silences, each with its own reasoning.
- Gym and wellness and banquet and event spaces — air change, and why an event is not an ambient.
- Dining stays neutral — the page to send your chef before the survey, not after.
- Brand: the SOSA founder story.
SOSA commercial scenting — facts verified August 2026: Vaayu ₹11,999, waterless cold-air nebulising, coverage up to 1000 m³ ≈ 2,000–3,000 sq ft, 400ml refillable sealed tank lasting up to about 90+ days depending on intensity and hours, Bluetooth app plus onboard buttons, run windows of 1h / 4h / 8h / 24h, day selection, adjustable intensity, auto-stop and key-lock, under 38 dB, freestanding, wall-mounted or HVAC-return mounting, DC 12V / 1A at 5W, CE, RoHS and SGS, black and white. Aangan ₹25,999, HVAC or AHU connection or standalone wall-mount or lay-flat, coverage up to 3,000 m³ ≈ 8,000–10,000 sq ft, 800ml reservoir, under 42 dB, DC 12V at 14W, intelligent PCB with programmable work and pause cycles and daily schedules, metal body 3.9 kg at 284 × 125 × 246 mm, black or white, one-year warranty, imported; it has no app and no Bluetooth, and no certifications are published for it. Meenar ₹38,500 is the larger-property option and is specified on enquiry; no coverage figure is published for it here. Ultrasonic machines: Sukoon ₹1,899 at 270–320 sq ft, Boond ₹899 at up to about 150 sq ft, Megh ₹3,499 with a six-litre tank and around 100 hours of runtime but only about 215 sq ft of coverage. Reed diffusers ₹749–₹849 for 50ml lasting 6–8 weeks and ₹1,249–₹1,349 for 130ml lasting 14–18 weeks, six fibre reeds, alcohol-free, phthalate-free, paraben-free, IFRA-compliant, 0 ppm formaldehyde, heat-stable CCT carrier, refillable glass bottle, tested at 45°C and 85% RH, composed in Pune. The Hotel Collection fragrance oils are water-based and ultrasonic-only at 15ml ₹299, 100ml ₹999 and 300ml ₹1,799; they are not for reed diffusers and not for the waterless commercial machines. No purchasable refill oil is listed for the waterless commercial machines — that fragrance is specified and quoted per property. SOSA publishes no leather fragrance in any format and no tobacco or smoky fragrance for any diffuser. SOSA sells no air purifier, no dehumidifier and no room spray for interiors, and makes no health, air-quality, VOC or mould claim. No dealer programme, reseller margin, trade price, territory or service contract is published. Free shipping above ₹499. A portion of every order supports girl-child education through Nanhi Kali. SOSA is an independent Indian fragrance house; the Hotel Collection scents are SOSA’s own interpretations inspired by the world’s finest hotels, and SOSA is not affiliated with or endorsed by any hotel brand. Prices subject to change — see the live product pages.