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Here is the mechanism in one sentence, and it carries this whole page: a closed door ends one connected body of air and begins another. Every coverage rating you will ever read - including SOSA's own approximately 1000 cubic metres for the Vaayu at ₹11,999 - assumes one connected volume. A machine cannot push scent through a shut door, and it has no particular inclination to push it against a pressure difference either. So a building is scented volume by volume rather than building by building, and in almost every commercial vertical that is a limitation to be worked around. In this one, it is the product.
Which means the answer to the question people usually ask - "can I have a lobby that feels considered without any of it reaching the theatres?" - is not "yes, if we are careful". It is "yes, because that is how air works, provided the door is a door and the machine is in the right room". The rest of this page is that proviso, done properly: what counts as a boundary, what does not, the volume arithmetic worked by hand for a real facility, and the three or four ways the arrangement is actually broken in practice.
Two things to fix in place before any of it. A scenting unit is never ducted into, or placed inside, air handling that serves a clinical area - not at a low setting, not on a timer, not ever. And the decision is not yours alone: what may be introduced into the air of a building containing a surgical zone is governed by the operator's own clinical leadership, infection-control policy and facilities engineering, and their decision overrides everything here.
How big is the part of the building I am actually scenting? Smaller than most facilities expect, which is why the purchase is smaller too. Work it by hand: floor area multiplied by ceiling height gives cubic feet, and cubic feet divided by 35.3 gives cubic metres. A 600 sq ft lobby at 14 ft is 8,400 cubic feet, about 238 cubic metres. A 400 sq ft reception and billing area at 12 ft is 4,800 cubic feet, about 136 cubic metres. A 700 sq ft attendant lounge at 12 ft is 8,400 cubic feet, about 238 cubic metres. Together that is 21,600 cubic feet, about 612 cubic metres, which one Vaayu at ₹11,999 covers comfortably if it is genuinely connected.
What breaks the arrangement in practice? Four things, none of them the fragrance. The machine standing in a supply airstream aimed at the clinical doorway. A shared return grille linking the lobby and the clinical corridor through a ceiling void. A corridor behaving as a plenum between areas that look separate on the drawing. And doors propped open for trolleys, which is a repeated real air event that no setting compensates for. Whether one air handler serves both halves is an engineering question for your own HVAC consultant rather than for a page.
The mechanism is the one that carries every commercial page SOSA publishes, and in a hospital it stops being a caveat and becomes the whole proposition. A coverage rating assumes one connected body of air. When a product page says approximately 1000 cubic metres, it means 1000 cubic metres of air that is joined up - a lobby that opens into a reception that opens into a lounge, with nothing shut between them. It does not mean 1000 cubic metres of building. A machine has no mechanism for getting scent through a closed door. It does not push hard, it does not push far, and it certainly does not push through a sealed leaf against whatever pressure relationship exists on the other side.
So the building divides itself, and your job is simply to find out where. Go and find the last real door. Walk from your entrance toward the clinical half the way a patient does, and identify the last door on that route that actually closes and is expected to stay closed. Not a curtain. Not an archway. Not a glazed screen that stops a foot short of the ceiling. Not a doorway with the leaf taken off years ago. A door, with a leaf, that latches. Everything on the lobby side of it is your scented volume. Everything on the far side is the fragrance-free zone, and that includes the corridor, the sub-waiting area, pre-operative bays, the procedure rooms, recovery, sterile and decontamination areas, clinical and drug storage and clinical waste.
Now do the volume arithmetic by hand, because the number changes what you buy and because it is thirty seconds of work. Floor area multiplied by ceiling height gives cubic feet, and cubic feet divided by 35.3 gives cubic metres. Take a real and fairly typical private day-surgery centre. Entrance and lobby, 600 sq ft at a 14 ft ceiling: 600 x 14 = 8,400 cubic feet, and 8,400 / 35.3 is about 238 cubic metres. Reception and billing, 400 sq ft at 12 ft: 400 x 12 = 4,800 cubic feet, about 136 cubic metres. Attendant and family lounge, 700 sq ft at 12 ft: 700 x 12 = 8,400 cubic feet, about 238 cubic metres again. If those three are genuinely open to one another, the connected public volume is 8,400 + 4,800 + 8,400 = 21,600 cubic feet, which is 21,600 / 35.3 = about 612 cubic metres.
Set that against the clinical half of the same building: say 3,200 sq ft at a 10 ft ceiling, which is 32,000 cubic feet, about 906 cubic metres. The building totals 4,900 sq ft of floor area, of which 1,700 sq ft is public - roughly 35 per cent. So you are buying for 612 cubic metres of connected air and deliberately not buying for 906. One Vaayu at ₹11,999, rated for approximately 1000 cubic metres of connected air, covers the public side with room to spare. And if the lounge turns out to sit behind its own closed door, it is a separate 238 cubic metre volume that either gets its own small unit - a Sukoon at ₹1,899 with the water-based Hotel Collection from ₹299 - or gets nothing, because the Vaayu in the lobby will not reach it.
That last sentence is the honest test of whether somebody believes the mechanism or is just quoting it. If a closed door really stops scent reaching your theatres, then it also stops it reaching your lounge. You do not get the protection without the limitation. I would rather sell you two small machines and have you understand why than sell you one big one and let you believe it goes through walls.
Then the two absolutes. A scenting unit is never ducted into, or placed inside, air handling that serves a clinical area, at any setting and on any timer - and whether a single air handler serves both halves of your building is an engineering question answered by your own HVAC consultant rather than by me. And what may be introduced into the air of a building containing a surgical zone is governed by your own clinical leadership, infection-control policy and facilities engineering, whose decision overrides every recommendation on this page. A portion of every SOSA order supports girl-child education through Nanhi Kali.
What makes this page worth writing is that most facilities arrive at it expecting to be told no, or expecting a hedge. They have usually already asked a supplier, been given something vague about "very subtle levels" and "healthcare-appropriate formulations", and correctly concluded that they were being managed rather than answered. There is no healthcare-appropriate formulation. There is no clinical grade. There is a boundary, and either your building has one or it does not, and you can find out this afternoon.
The second thing worth saying is that the arrangement is usually broken by geography rather than by chemistry. When I am told a facility's fragrance is "getting into the back", it is almost never because the register was too strong. It is because the machine is standing in the corridor, because the free socket was there. Or it is sitting in front of a supply grille, so the ductwork is now deciding where the fragrance goes. Or there is a shared return grille linking the lobby ceiling void to the corridor ceiling void, quietly moving air between two rooms that look entirely separate on the drawing. Or the door is propped for trolleys thirty times a morning. Those are placement and air-handling problems with placement and air-handling answers, and the mechanism page in this section walks through all of them in the order you should check them.
The third is a discipline that costs nothing and saves the arrangement over time. Write the scented volume and the fragrance-free zone as two lists of named rooms on the same drawing, mark the door that separates them, and tape a card to the machine with the register and the setting on it. Boundaries decay when they exist only as a shared understanding among people who were there at the time. A facility director who can hand a new housekeeping supervisor a drawing has a boundary. One who has to explain it has a rumour.
And the fourth, which I will keep repeating because it is the point of the whole bank: none of this is a matter for a fragrance house to settle unilaterally. Take the marked plan, the ceiling heights, the proposed machine position and the room lists to your clinical leadership, your infection-control team and your facilities engineers before you buy anything. Get the answer in writing. If they extend the fragrance-free zone, that is the answer. If they say no to the idea entirely, that is also the answer, and it is a perfectly respectable one.
How a closed door turns two halves of a building into two separate bodies of air
Three factors decide whether you can genuinely have a scented reception and a neutral surgical zone, and all three are about the building rather than the bottle. The first is the door, which is the mechanism itself and deserves to be understood rather than merely believed. The second is the arithmetic, worked end to end for a real facility so you can do the same for yours in ten minutes. The third is the set of rules that keep the arrangement intact once it exists - where the machine may stand, what it may never be connected to, and who owns the decision.
Before those, a distinction worth making early, because it is the source of most confusion in this category. There are two completely different questions hiding inside "can I keep the surgical zone neutral". The first is can scent physically reach it, which is a question about doors, air handling and placement, and which has a clear answer. The second is is the arrangement acceptable to the people who run the clinical half, which is a question about policy and judgement, and which only they can answer. This page can help enormously with the first and cannot answer the second at all. Do not confuse a good answer to the first for permission on the second.
It is also worth naming what a "boundary" actually is, because plans routinely credit things that do not qualify. A boundary is a door with a leaf that closes and latches, in a wall that goes to the structural ceiling. That is it. A curtain is not a boundary - it stops sight and a little sound and does nothing to air. A screen is not a boundary. A glazed partition that stops below the slab is not a boundary, because the ceiling void above it is a continuous space. An archway, a cased opening, a doorway whose leaf was removed during a refurbishment, a lift lobby shared by both halves, a stair core open at both ends: none of these divide air. If you can walk through it without opening anything, air can too.
And one honest limitation stated up front, because it will save somebody a wasted purchase. If the last real door on the route from your lobby to your clinical half does not exist - if reception simply becomes a corridor which simply becomes a pre-operative bay area behind curtains - then the arrangement described on this page is not available to you as drawn. That is not a reason to buy a quieter machine. It is a reason to move the machine, shrink the scented volume to a genuinely separated part of the front of house, or not scent at all. All three of those are better outcomes than a low setting hoping for the best, and the third one is a perfectly good result.
Every coverage figure published by every diffuser manufacturer, SOSA included, is a figure for one connected body of air. The Vaayu at ₹11,999 is rated for approximately 1000 cubic metres of connected air, and SOSA's own copy also states 2,000 to 3,000 sq ft scented evenly. Those numbers describe air that is joined up, not floor area that appears on the same drawing. A machine produces a very small quantity of fragrance into the air around it and relies on the ordinary movement of that air - convection, the air handling, people walking about - to distribute it. It has no mechanism for forcing anything through a shut door. It does not push hard, it does not push far, and it does not push through a leaf in a frame.
Which means a building divides itself into volumes, and the divisions are made of doors. That is genuinely all there is to it. In a showroom, a restaurant or a hotel this is an annoyance, because it means one machine does not do a whole building and people have to be told that the coverage number is not a floor-area number. In a day-care hospital it is the reason you can sell the thing at all. Scented public half, wholly neutral clinical half, separated by a door that is already shut for reasons that have nothing to do with fragrance. Nobody has to change how the building works. The boundary is already there; you are simply agreeing to respect it.
Now the part that requires honesty, because it is where most suppliers stop. The mechanism cuts both ways and you do not get to invoke it selectively. If a closed door prevents fragrance reaching your theatres, the same closed door prevents fragrance reaching your attendant lounge. A great many facilities have a lounge that sits off the lobby behind its own door, and they are disappointed to learn that one machine at reception does not scent it. That disappointment is the mechanism working correctly. Either prop nothing and buy a second small unit for the lounge - a Boond at ₹899 or a Sukoon at ₹1,899 with the water-based Hotel Collection from ₹299 - or accept that the lounge is unscented. What you must not do is turn the lobby machine up in the hope of pushing through, because all that achieves is an over-scented lobby with an unscented lounge, and a louder signal arriving at every other opening in the building including the one you care about.
So go and audit your doors, and be strict about what counts. A boundary is a door with a leaf that closes and latches, in a wall that continues to the structural slab. Things that are not boundaries, and that plans regularly credit as if they were: a curtain on a track, a portable screen, a glazed partition that stops below the slab so the ceiling void runs over the top of it, an archway or cased opening, a doorway whose leaf was removed in a refurbishment and never replaced, an automatic sliding door that stands open for most of the working day, a lift lobby serving both halves, and an open stair core. If you can walk through it without opening anything, air goes through it too.
Two further notes that belong to the mechanism rather than anywhere else. First, doors that are shut most of the time but opened often are a partial boundary rather than a full one, and the mechanism page in this section deals with exactly how partial. Second, the pressure relationship between a clinical room or corridor and the space beside it is set deliberately by the people who designed the air handling, for reasons that are theirs. I do not know what yours is, I will not guess at it, and I am not going to describe a SOSA product as compatible with it or protected by it. What I will say is the plain consequence for my own subject: air movement in a healthcare building is arranged rather than accidental, so where your fragrance goes is decided at least as much by the ductwork as by the machine - which is why placement is checked with your own facilities engineers before anything is drilled into a wall.
The two conversions, and they are the only two you need. Floor area multiplied by ceiling height gives cubic feet. Cubic feet divided by 35.3 gives cubic metres. State the ceiling height you assumed every single time, because in a hospital it varies more than in any other building type: lobbies are commonly 10 to 14 ft, a purpose-built double-height entrance can be 16 to 20 ft, and clinical rooms are often 9 to 10 ft. Getting the height wrong by 4 ft on a 1,000 sq ft lobby is a 4,000 cubic foot error, which is about 113 cubic metres, which is more air than an entire procedure room.
The public half. Entrance and lobby, 600 sq ft at 14 ft: 600 x 14 = 8,400 cubic feet. 8,400 / 35.3 = about 238 cubic metres. Reception and billing counter, 400 sq ft at 12 ft: 400 x 12 = 4,800 cubic feet. 4,800 / 35.3 = about 136 cubic metres. Attendant and family lounge, 700 sq ft at 12 ft: 700 x 12 = 8,400 cubic feet, about 238 cubic metres.
Add them only if they are genuinely connected - no doors between them, or doors that are permanently hooked back and will stay that way. 8,400 + 4,800 + 8,400 = 21,600 cubic feet, and 21,600 / 35.3 = about 612 cubic metres. That is the number you are buying for. Against the Vaayu's approximately 1000 cubic metres of connected air, one machine covers it with genuine headroom, which is the right place to be: a machine running comfortably below its ceiling in a large volume is far easier to keep at a low perceived level than a small machine working hard.
The clinical half, for scale rather than for buying. Say 3,200 sq ft at a 10 ft ceiling: 3,200 x 10 = 32,000 cubic feet, and 32,000 / 35.3 = about 906 cubic metres. You are not buying anything for this. It is worth calculating purely so that the proportions are visible: the building is 4,900 sq ft of floor area, of which 1,700 sq ft - roughly 35 per cent - is in scope. In cubic metres the split is 612 against 906, so about 40 per cent of the building's air is scented and 60 per cent is deliberately not. Most facility directors are surprised by that the first time they see it, and it is the honest reason the purchase is smaller than expected.
Now the variations, because your building will not be this one.
If the lounge sits behind its own door: the connected lobby and reception volume is 8,400 + 4,800 = 13,200 cubic feet, about 374 cubic metres, and the lounge is a separate 238 cubic metre volume. Two machines, or one machine and an unscented lounge. A Sukoon at ₹1,899 handles the second volume, or a Megh at ₹3,499 if it runs from seven in the morning to eight at night and you would rather nobody refilled at lunchtime.
If the entrance is double height at 18 ft: 600 x 18 = 10,800 cubic feet, about 306 cubic metres for the lobby alone, and the connected total becomes 10,800 + 4,800 + 8,400 = 24,000 cubic feet, about 680 cubic metres. Still one Vaayu, but with less headroom, and with the honest caveat that a tall volume with automatic doors opening constantly is the hardest place in the building to hold a perceived level.
If the front of house is small - a 300 sq ft reception at 10 ft is 3,000 cubic feet, about 85 cubic metres, and a 500 sq ft waiting area at 12 ft is 6,000 cubic feet, about 170 cubic metres - then you are looking at 255 cubic metres of connected air, a Vaayu is substantially over-specified, and the honest recommendation is an ultrasonic or even a reed diffuser from ₹749 at the counter. That is a real outcome and it happens often.
And if the whole front of house is one large connected floor - say 3,000 sq ft at 12 ft, which is 36,000 cubic feet, about 1,020 cubic metres - you are at the edge of a single Vaayu and should be talking to SOSA on WhatsApp with the plan in hand rather than guessing between one machine and two.
One last note on the clinical numbers, because people ask. A 300 sq ft procedure room at 10 ft is 3,000 cubic feet, about 85 cubic metres. A 450 sq ft recovery bay area at 10 ft is 4,500 cubic feet, about 128 cubic metres. Those are calculated here only to show how small they are relative to the public half, and how obviously they sit outside any coverage figure. They are not being sized for anything, because nothing is going in them.
The unit goes inside the volume it is scenting, facing into it. Not in a corridor, not on a landing, not in a lift lobby that serves both halves, not in a doorway. A corridor is a fifteen-second space that connects everything to everything and often behaves as a plenum between areas that look entirely separate on the drawing. A machine standing in a corridor is not scenting a room - it is charging a connector that feeds every door along it, including the one that matters. The free socket is not a reason. Run an extension, move a desk, or pick a different wall.
Stand it as far from the clinical doorway as the room allows, and aim it away. This costs nothing at installation and is very expensive to fix afterwards. If the only sensible position in your lobby happens to be beside the door to the clinical half, that is a signal to reconsider the whole placement rather than a detail to accept.
Keep it out of a supply airstream. A unit standing directly in front of, or underneath, a supply grille has had its placement decided for it by the ductwork. Whatever direction that grille throws is now the direction your fragrance travels, at whatever velocity the system runs at, and if that direction is toward the clinical doorway you have built a delivery system. Look up before you decide where the machine goes.
Keep it away from return grilles. A return does two unhelpful things at once: it removes your fragrance from the room you meant to fill, so you end up raising the level to compensate, and it puts that fragrance into a ceiling void which may be shared with somewhere it should never go. A shared return linking a lobby and a clinical corridor through a common void is one of the commonest reasons a facility reports scent "getting into the back", and it is invisible from floor level.
Never duct a scenting unit into air handling that serves a clinical area. Not at a low setting. Not on a timer. Not "only into the public branch of a shared system". The ducted SOSA 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 HVAC decisions taken with your own consultant, and in a facility with a surgical zone the first question in that conversation is which air handler serves what. If one unit serves both halves of your building, that is an engineering question with an engineering answer and it belongs to your HVAC consultant rather than to a fragrance page. A ducted machine is not the default answer in this building type; a freestanding unit in a lobby usually is.
And never, in any phrasing, reduce air exchange so that fragrance lasts longer. No closing vents, no turning down extraction, no propping something shut, no asking whether the air conditioning could run less in the mornings. In a healthcare building that is the worst sentence anybody in my trade could write, and I am not going to write it. A well-ventilated lobby is genuinely harder to scent - particularly one with automatic entrance doors exchanging air with the street on every arrival and discharge - and the honest answer to that is correct sizing, better placement and patience. Ventilation wins. The engineers win. Always.
Then verify it, with a nose that has not been in the building. Adaptation happens within minutes and is completely ordinary, which is why the person who set the level is the worst possible judge of it. Bring somebody in off the street. Walk the route from the entrance inward, pausing at the threshold of each space, and then walk it again in reverse, because the two directions tell you different things - going in, you are tracking where the scent gets to; coming out, you notice the step change at each boundary, which is the thing you actually want to confirm. Do it on a Monday morning into a building that has been shut since Saturday, and again during a busy list when doors are being used properly.
And the decision that outranks every line above. What may be introduced into the air of a building containing a surgical zone is governed by the operator's own clinical leadership, its infection-control policy and its facilities engineering. Take them the marked plan, the ceiling heights, the volume arithmetic, the proposed machine position and both room lists before anything is bought. Get the answer in writing. Treat it as final in both directions. Nothing on this page is clinical, infection-control or engineering advice, no SOSA product is a medical device, a clinical product, an infection-control product or an air-treatment device, and none is validated for clinical use.
- Walk the patient route and find the last door that actually closes and latches.
- Measure the public half by hand: area times height, then divide by 35.3.
- Size one machine for that connected volume, not for the whole building.
- Verify with a fresh nose from the lobby inward, then repeat the walk in reverse.
The worked example, end to end, with the arithmetic done by hand
With the boundary established and the volume measured, the register question becomes the small one it should be. There are seven in the water-based Hotel Collection, each SOSA's own hotel-inspired interpretation; SOSA is independent and is not affiliated with, endorsed by or connected to any hotel brand.
In a building with a surgical zone the filter runs before taste, and it is one word long: unsweet. White Tea Serenity - white tea, aloe and cedar - is clean, weightless and spa-like, and it is the register that most naturally lets a room read as clean rather than as scented, which is the exact distinction a hospital is making. Quiet Luxury - white tea, bergamot and cedar - is the same idea with more finish, hushed and polished, and it is the safest single decision in the collection for a very mixed public. Forest Suite - cedarwood, vetiver and green leaves - is grounding and green and belongs in a lobby with timber, stone or real planting, where it reads as structural rather than decorative. Tea Garden - jasmine, green tea and white tea - is the least risky floral because the jasmine sits inside the tea, and it is a step warmer, so it wants a lower setting. Warm Welcome - citrus, floral and sandalwood - is a genuine threshold register for a family-facing neighbourhood facility, used at a fraction of hotel level. Old-World Glamour - amber, violet and woods - is plush, and plush in a clinical building is exactly the character that reads as covering something. Lobby Bar - citrus, pepper and amber - is bold and after-dark and has no home here at all.
I will not rank those seven on measured throw or longevity. SOSA does not publish that comparison, and connected volume, ceiling height, ventilation rate, automatic-door traffic and the setting you choose swamp any difference between blends in a lobby nobody has stood in. The Vaayu and the ducted machines run four hotel-inspired waterless blends instead, supplied with the machine as one of three bundle choices - two different fragrance systems rather than the same bottle in two sizes, and the ₹299 water-based bottle never goes into a Vaayu.
What matters far more than which of the three sensible registers you pick is holding one of them at one level across the whole public half. That is what makes the arrangement legible. If the lobby, the counter and the lounge all carry the same character at the same perceived level, and then there is a door, and behind that door there is nothing, the building reads as deliberate. If the lobby is one thing, the lounge is something a supervisor bought separately, and the corridor smells faintly of both, the building reads as unmanaged - and in a hospital, unmanaged is the impression you are working hardest to avoid.
A note on matching levels rather than settings, because it matters once you have more than one volume. If the lounge is behind its own door and gets its own machine, do not set both units to the same number. Set them to the same perceived level, judged by a person walking from one to the other. A 238 cubic metre lounge with soft furnishing and a closed door behaves completely differently from a 238 cubic metre double-height lobby with automatic doors opening every ninety seconds. Two identical settings in those two rooms will not produce two identical rooms. Write both numbers down once they are right.
And the level itself, set the way it should be set: low on day one, lower than feels like it is working, written on a card taped to the machine, and untouched for two weeks. Judge it from the doorway on a Monday morning into a building that has been shut since Saturday evening, not from behind the counter on a Friday afternoon when your nose has been in it for eight hours. Ask three people who have just walked in off the street what they notice before you tell them a diffuser exists. If nobody mentions it and nobody is bothered, you are approximately right. If two of the three can name a product, come down. And if a visitor or a member of staff reports that they react to fragrance, switching off a named unit is a standing arrangement that anybody on the desk can action without finding a manager first - that is a recalibration signal rather than a tolerance problem.
| Scent | Why it suits the mood |
|---|---|
| Entrance and lobby, 600 sq ft at 14 ft · about 238 m3 | 600 x 14 = 8,400 cubic feet, and 8,400 / 35.3 is about 238 cubic metres. The hardest volume in the building to hold a level in, because the automatic doors exchange air with the street on every arrival and discharge. At a double-height 18 ft the same footprint is 10,800 cubic feet, about 306 cubic metres, so state the height you assumed every time. |
| Reception and billing, 400 sq ft at 12 ft · about 136 m3 | 400 x 12 = 4,800 cubic feet, and 4,800 / 35.3 is about 136 cubic metres. The opportunity, and often the only one that matters. Dwell is unpredictable - four minutes at check-in, forty when the list slips - so set for the long tail rather than the average, which in practice means lower than instinct suggests. |
| Attendant lounge, 700 sq ft at 12 ft · about 238 m3 | 700 x 12 = 8,400 cubic feet, about 238 cubic metres. Connected to the lobby it simply adds to the total; behind its own door it is a separate volume that needs its own small unit or gets nothing at all. That is the mechanism working correctly rather than a shortfall in the machine. |
| Connected public total · about 612 m3 of 4,900 sq ft | 8,400 + 4,800 + 8,400 = 21,600 cubic feet, about 612 cubic metres - comfortably inside one Vaayu rated for approximately 1000 cubic metres of connected air. The clinical half of the same building, 3,200 sq ft at 10 ft, is 32,000 cubic feet or about 906 cubic metres, and you are deliberately buying nothing for it. |
So the purchase, sized to the arithmetic rather than to the floor plan. For a connected public front of house around 600 cubic metres, the waterless SOSA Vaayu at ₹11,999 is the machine: rated for 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 or wall and HVAC mounting, DC 12V / 1A at 5W so it needs a live socket, and CE, RoHS and SGS. In this building type its real argument is what it does not do - cold-air nebulising of undiluted oil means no water, no humidity and no wet residue anywhere in a facility with a surgical zone - and the Bluetooth app and timer mean you scent OPD hours only rather than running quietly into a closed building overnight. It is an ambient fragrance product for public areas, not a medical device, not an infection-control or air-treatment device, and not validated for clinical use.
For smaller or separated volumes, the ultrasonics do the work: the SOSA Boond at ₹899 for a small enclosed desk or a modest separate lounge, the SOSA Sukoon at ₹1,899 for a reception and billing area of 100 to 150 cubic metres, and the SOSA Megh at ₹3,499 with its 6 litre tank where a lounge runs all day. All three take the water-based Hotel Collection from ₹299, with 100ml refills at ₹999, and the pack of seven 15ml bottles at ₹1,799 is how you audition registers in your own air over five days each. The ₹299 water-based bottle never goes into a Vaayu or into Aangan at ₹25,999 or Meenar at ₹38,500, which run waterless nebulising oil and are ducted decisions taken with your own HVAC consultant - never into air handling that serves a clinical zone.
And if the honest answer for your building is smaller still, the SOSA reed diffusers from ₹749 are a real option rather than a consolation: no plug, no noise, nothing to switch off, about 6 to 10 weeks per bottle, with Mountain Breeze at ₹849 - Himalayan pine, sage and cedar - and Morning Freshness at ₹749 - Malabar lemon, mint and eucalyptus - sitting closest to a healthcare counter. Garden Bloom at ₹799 and Evening Calm at ₹799 are softer options, and Fresh Brew at ₹849 is the wrong shape here. The 130ml is from ₹1,249, 300ml refills ₹2,399, 500ml ₹3,499. A reed is a local thing that does not cross a lobby, which in a building with a boundary to respect is a genuine advantage.
The rest of this section takes the argument further in three directions. The room-by-room case for why the clinical half gets nothing at all, and why that costs you nothing commercially, is in should day-surgery procedure rooms be fragrance-free. The separate and stronger argument for recovery specifically, including why a curtained bay is one volume rather than several, is in should post-procedure recovery areas remain fragrance-free. And the detailed mechanism - supply airstreams, shared returns, corridor plenums, door undercuts and propped doors, in the order you check them - is in how to prevent lobby fragrance from travelling into procedure areas.
What SOSA does not publish and this page will not invent: consumption rate, refill frequency, monthly running cost, machine lifespan, minimum order quantity or installation lead time. Those depend on run hours, connected volume and setting, and they are yours rather than ours. Send the plan, the heights and your two room lists on WhatsApp at +91 96192 18531 and you will get an honest sizing, including "you need less than you think" where that is true. Bulk orders are welcome, custom label or logo on product is available, and bespoke composition 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, because consistency makes a signature and uniqueness does not.
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.
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