This is the mechanism page for this section, so it is mostly practical. The unit sits in the lounge, facing into the volume you intend to hold, and never in the corridor between the lounge and anything else - because a machine in a corridor is not scenting a room, it is dosing a connector. You check which way the air handling moves, because a unit standing in a supply airstream is feeding a duct rather than filling a room. You mind the door undercut and any shared return grille, which are the two leak paths that defeat more good plans than anything else. And you verify by walking from the lounge toward the clinical boundary with somebody whose nose has just come in from outside, and standing at the closed door.
Then there is the other half of the question, which is what "signature" actually means, and the honest answer there is cheaper than the expensive one. A signature is made by consistency, not by uniqueness. One of the seven registers, held at one written-down level, in the same room, for three years, is a signature - because the family who came in March and returns in September meets the same air twice. Bespoke composition is a real SOSA service and it is discussed on WhatsApp rather than priced on a page, but the cheaper honest answer comes first.
And the standing point: none of this is engineering advice. What may be introduced into the air of a building with a surgical zone is decided by your own clinical leadership, infection-control policy and facilities engineers, a scenting unit is never ducted into air handling that serves a clinical zone, and their decision overrides every recommendation here.
How do I verify that the scent is not reaching the clinical side? Run the lounge at its intended level for a full day, then bring in somebody who has not been in the building and walk with them from the lounge toward the clinical boundary. Stand at the boundary door with it closed. A fresh nose is the only valid instrument here, because yours stopped reporting the scent within minutes of arriving. If anything is detectable, you have a leak path - a door undercut, a shared return, a corridor acting as a plenum - and the fix is to move the unit and re-test, never to reduce ventilation.
Do I need a bespoke fragrance to have a signature? No. A signature is made by consistency rather than by uniqueness: one of the seven Hotel Collection registers from ₹299, held at one written-down level in the same room for years, is a signature, because a family who visits twice meets the same air twice. Bespoke composition is a real SOSA service and it is discussed on WhatsApp rather than priced on a page - but the cheaper honest answer comes first, and for most facilities it is also the better one.
Every coverage figure in this trade, SOSA's included, assumes one connected volume. The SOSA Vaayu at ₹11,999 is rated for approximately 1000 cubic metres of connected air, and the word doing the work in that phrase is "connected". A machine has no way to push scent through a closed door, and it has no particular ability to push it against a pressure difference either. So a building is scented volume by volume rather than building by building, and in a day-care hospital that is not a limitation to work around. It is the feature. It is precisely what makes "scented family lounge, neutral patient zone" a thing you can deliver rather than a claim you are hoping nobody tests.
Here is what that looks like in a real plan. Take a family lounge of 600 sq ft with a 12 ft ceiling: 600 x 12 = 7,200 cubic feet, and 7,200 divided by 35.3 is about 204 cubic metres. Next to it, a patient waiting area of 400 sq ft at 10 ft: 4,000 cubic feet, about 113 cubic metres. If there is a door between them that stays shut, those are two volumes and you may treat them differently - 204 cubic metres held at a low level, and 113 cubic metres at zero. If the door is propped open all day, or there is no door at all, they are one volume of 11,200 cubic feet, about 317 cubic metres, and there is no arrangement of machines that will give you two answers inside it. The plan you can execute is decided by the doors, not by the drawing.
Which is why the practical detail in this page matters more than the principle. The unit sits in the lounge, placed inside the volume you intend to hold and facing into it, away from the doorway and away from any return grille. It never sits in the corridor between the lounge and anything else, which is where machines physically end up because that is where the free socket is - and a machine in a corridor is not scenting a room, it is dosing the connector between rooms and testing every door along it. Check which way the air handling moves, because a unit standing in a supply airstream has stopped being a room diffuser and become a way of distributing fragrance to wherever that duct goes. Mind the door undercut, which is the deliberate gap under a door and does exactly what it was designed to do. And find out whether the lounge and the corridor share a return grille, because air leaving your lounge through a shared return passes through the path it shares, and that is invisible on a floor plan.
Then verify, because drawings are optimistic and installers are busy. Run the lounge at its intended level for a full day. Bring somebody into the building who has not been in it, because your own nose stopped reporting the scent within minutes of arriving. Walk with them from the middle of the lounge toward the clinical boundary, slowly, stopping at each doorway. Stand at the boundary door with it closed. If they detect anything at that door, you have a leak path, and the response is to move the unit and re-test rather than to lower the level. Lowering the level makes a leak fainter; it does not close it. And the thing this bank will never suggest in any phrasing: do not reduce ventilation, close a vent or alter air handling so the fragrance behaves better. Ventilation and the engineers win, every time.
All of which is subject to the decision that outranks it. This is an engineering question in a building with a surgical zone, and it is answered by your own facilities engineers and HVAC consultant together with your clinical and infection-control leadership, not by a page and not by a supplier. Take the drawing to them with both lists on it - the rooms that will carry a register and the rooms that will carry nothing - and get one answer in writing. A portion of every SOSA order supports girl-child education through Nanhi Kali.
The reason this page is worth reading even if you already accepted the principle is that the principle is easy and the execution is where facilities lose. I have walked into buildings with an immaculate fragrance-free zone list on the drawing and a diffuser standing in the corridor six feet from the door that list was written to protect. Nobody decided that. It happened because the lounge had no spare socket, the corridor did, and the installation was done by somebody who had been given a machine and not a plan.
So make the socket part of the specification. Before you buy anything, stand in the lounge and find the point where you would want the unit - inside the volume, away from the door, away from a grille, out of the direct path of a supply vent - and check whether there is a live socket there. The Vaayu runs on DC 12V / 1A at 5W and is mains powered, so it needs one. If there is no socket in the right place, the answer is an electrician, not a different place for the machine. That is a small cost that protects the entire design.
The second execution point is the door itself. A design that depends on a door being shut depends on the door actually being shut, and doors in day-surgery centres get propped: for a trolley, for a delivery, because the corridor is warm, because somebody is waiting for a colleague. If the boundary door between your lounge and the rest of the building is propped for an hour a day, you do not have two volumes for that hour. Either the door gets a closer and a rule, or the design changes to match the building you actually have.
And the third is the part nobody enjoys: write it down, then check it again in six months. The placement, the level, the hours and the verification walk all belong in the facility SOP next to the fragrance-free room list. Re-walk the boundary whenever anything physical changes - a partition, a new machine, a rebalanced air-conditioning system, a door replaced without a closer. A verification that happened once, two years ago, is a story rather than a control.
The mechanism - a closed door ends one connected body of air
Three things decide whether this works, and only one of them is about fragrance. The first is the mechanism: which volumes your building actually has, which is a question about doors and air handling rather than about walls. The second is placement and arithmetic: where the unit stands, and how much air you are asking it to hold. The third is verification and governance: how you prove the arrangement is real, who signs it off, and what keeps it true in year three.
Start by being precise about what a connected volume is, because the phrase gets used loosely. Two spaces are one volume if air moves freely between them - an open doorway, a permanently propped door, a half-height partition, a room open along a corridor. They are two volumes if a door that stays shut separates them, and if the air handling does not join them behind your back. That second condition is the one nobody checks, and it is the reason this page keeps returning to return grilles and undercuts. A wall with a shut door in it is a good separator of air. A wall with a shut door in it and a shared return path above the ceiling is a much weaker one.
Then the arithmetic, done by hand, because it decides the machine. A 500 sq ft family lounge at a 12 ft ceiling is 500 x 12 = 6,000 cubic feet, and 6,000 divided by 35.3 is about 170 cubic metres. A 600 sq ft lounge at 12 ft is 7,200 cubic feet, about 204 cubic metres. A 900 sq ft lounge at 12 ft is 10,800 cubic feet, about 306 cubic metres. A 1,000 sq ft lounge at 14 ft is 14,000 cubic feet, about 397 cubic metres. Compare those with a Vaayu rated for approximately 1000 cubic metres of connected air and the honest finding of this bank appears again: a single family lounge is a fraction of that machine's rating, and the purchase is smaller than most facilities arrive expecting. That is the correct answer arriving early rather than a problem to be solved with a bigger unit.
And the last piece of framing, which is about the word "signature". A signature is not a smell nobody else has. It is a smell your building has every time. The facility that runs one register at one written-down level in one room for three years has a signature. The facility that commissioned something bespoke and then let the level drift, changed the bottle when a new supervisor arrived, and put a second register in the lobby has an expense. Consistency is the mechanism, and it is free.
What it promises is that a diffuser has no mechanism for moving scent through a shut door. What it does not promise is that your building has no other path between the two spaces. Buildings are full of deliberate air paths, and every one of them was put there for a good reason by somebody who was not thinking about fragrance. There are four that matter, and all four are physical rather than olfactory.
The door undercut. The gap under a door exists so that air can move, usually so a room can be ventilated or pressurised correctly. It does exactly what it was designed to do, which means a shut door with an undercut is a partial separator rather than a seal. In practice a low level in a lounge and a properly sized undercut rarely produce a detectable result at a boundary door several metres further on - but it is the first thing to check when a verification walk fails, and it is the reason a unit is never placed near the door it is supposed to be scenting away from.
The shared return grille. This is the one that defeats good plans. Two rooms that look separate on a drawing can be served by the same return path, so air leaving your lounge travels through a route shared with the space next door. You cannot see it, it does not appear on the architectural plan, and the only people who can tell you about it are the ones who designed or maintain the air handling. If the lounge holds a register well and somewhere unrelated smells faintly of it, stop looking at the machine and ask about the returns.
The corridor acting as a plenum. In some buildings the corridor is not a neutral gap between rooms; it is part of the air path, and air is deliberately moved through it. A machine in that corridor, or a lounge that discharges into it, is then connected to everything the corridor serves. This is the single strongest argument for the rule that the unit sits in the room and never in the corridor between rooms.
A unit standing in a supply airstream. Put a diffuser directly under or in front of a supply vent and it stops being a room diffuser. It becomes a way of introducing fragrance into moving air that is going wherever that system sends it. This one is entirely avoidable and entirely common, because the spot under the vent is often the spot with the shelf.
None of those four has a fragrance answer, and that is the point of listing them. They are placement and air-handling questions, they are answered by your own facilities engineers and HVAC consultant, and a scenting unit is never ducted into air handling that serves a clinical zone. Where an HVAC-integrated machine is being considered at all - Aangan at ₹25,999 for approximately 8,000 to 10,000 sq ft, Meenar at ₹38,500 for approximately 12,000 to 18,000 sq ft - that is an engineering decision taken with your own consultant about which air handling unit serves which zones, and in a building with a surgical zone it is a conversation before it is a purchase.
And the sentence that never appears in this bank in any phrasing: do not reduce ventilation, close a vent, restrict extraction or alter air handling so that fragrance lasts longer or stays where you want it. A well-ventilated lounge is genuinely harder to hold, and that is an honest cost of a healthy building rather than a problem to be engineered away. Ventilation wins. You solve it with placement, sizing and a low steady level.
In the volume you intend to hold. The machine belongs inside the lounge, positioned so that the room it is filling is the room you decided to fill. Not in the doorway, not just outside it, not in the lobby edge that happens to be nearest. If the lounge is the scented room, the machine is in the lounge.
Facing into the room, away from the doors. Point the output at the body of the room rather than at the opening. A machine near a door is spending part of its output on the corridor and part on testing whatever is at the other end of it.
Away from return grilles and out of supply airstreams. A unit next to a return is feeding the extract rather than the room, which is both wasteful and unpredictable. A unit in a supply airstream is feeding the duct. Look up before you choose the shelf.
Never in the corridor between the lounge and anything else. This is the rule that protects the whole design, and it is broken for the most mundane reason in the world: the corridor has a socket and the lounge does not. Solve that with an electrician rather than by moving the machine. The Vaayu is mains powered at DC 12V / 1A, 5W and needs a live socket where you want it, and the cost of adding one is trivial against the cost of an arrangement that does not hold.
Now the arithmetic, by hand, because it decides what you buy. Floor area multiplied by ceiling height gives cubic feet; cubic feet divided by 35.3 gives cubic metres. A 400 sq ft lounge at 10 ft is 4,000 cubic feet, about 113 cubic metres. A 500 sq ft lounge at 12 ft is 6,000 cubic feet, about 170 cubic metres. A 600 sq ft lounge at 12 ft is 7,200 cubic feet, about 204 cubic metres. An 800 sq ft lounge at 12 ft is 9,600 cubic feet, about 272 cubic metres. A 1,000 sq ft premium lounge at 14 ft is 14,000 cubic feet, about 397 cubic metres. And if a lounge opens into a reception that you also intend to scent with the same register, add them: a 600 sq ft lounge plus a 400 sq ft reception at 12 ft is 1,000 x 12 = 12,000 cubic feet, about 340 cubic metres, as one connected volume with one machine in it.
Set those against the range. A SOSA Sukoon at ₹1,899 with the water-based Hotel Collection from ₹299 is the honest answer for most single family lounges. A SOSA Megh at ₹3,499 with a 6 litre tank is the answer where the room runs from before dawn to the last discharge and nobody should be refilling in front of waiting families. The waterless SOSA Vaayu at ₹11,999, rated for approximately 1000 cubic metres of connected air, is the answer where the scented volume is genuinely large and connected, or where the timer and app matter because the room must never run outside its hours.
One more placement point that is specific to a healthcare building and is the whole reason a facility with a surgical zone will consider a machine at all. The Vaayu is waterless cold-air nebulising of undiluted oil: no water, no humidity, no wet residue anywhere. There is no tank of standing water in a public room, nothing damp, nothing to wipe off a surface. That is the property that gets it through conversations that a water-based machine does not get through, and it is worth raising with your infection-control lead early rather than late. It remains an ambient fragrance product for public areas: not a medical device, not an infection-control or air-treatment device, not validated for clinical use, and it adds scent rather than removing odour.
And the two systems are not interchangeable. The ₹299 water-based bottle runs in the ultrasonics and never goes into a Vaayu or an HVAC machine. If you expect to move from an ultrasonic to a Vaayu when the lounge is finished, say so before you buy so nobody ends up with the wrong bottle for the right machine.
The walk. Run the lounge at its intended level for a full day, so the room is in its normal state rather than freshly started. Then bring in somebody who has not been in the building that day - a colleague from another site, somebody's spouse, anybody with a nose that has just come in from outside. Yours does not qualify, and this is not a criticism of your nose; adaptation happens to everybody within minutes and it is the reason the person who cares most is the person least able to judge. Walk with them from the middle of the lounge toward the clinical boundary, stopping at each doorway, and ask at each stop what they can detect. Then stand at the boundary door with it closed, on the clinical side, and ask again.
What the result means. Nothing detectable at the closed boundary door is what you are looking for, and it is the normal outcome of a correctly placed unit at a correctly low level. Something detectable means you have a leak path, and the response is diagnostic rather than cosmetic: move the unit further into the lounge, away from the door and away from any grille, and re-walk. If it persists, the question has moved out of your hands and into your engineers': undercut, shared return, corridor plenum, supply airstream. What you do not do is turn the level down and call it solved, because a fainter leak is still a leak and the level will drift back up within a year.
Who signs it off. The walk is evidence, not authority. The decision belongs to your clinical leadership, your infection-control policy and your facilities engineering, taken together rather than separately so that you get one answer rather than three. Bring them a drawing with two lists on it: the rooms that will carry a register, and the rooms that will carry nothing - pre-operative areas and holding bays, procedure and operating rooms, post-procedure and post-anaesthesia recovery, sterile and decontamination areas, clinical and drug storage, clinical waste. Ask them explicitly about placement and air paths, because those are the questions that matter to them. Write down whatever they decide, including any level ceiling and who may change it, and put it in the facility SOP. They may extend the fragrance-free list, and they may rule out the whole idea, and either is a complete and legitimate answer.
Then the signature half of the question, which is where most facilities spend money they did not need to spend. A signature is made by consistency, not by uniqueness. The family who came for a pre-operative consultation in March and returns for the procedure in September meets your building twice, and what makes those two visits feel like one place is that the air was the same. One register, one level, one room, written on a card taped to the machine and repeated for three years, is a signature. It costs ₹299 a bottle and ten minutes of governance.
Bespoke composition is a real SOSA service - a register made only for your group - and it is discussed on WhatsApp rather than priced on a page, with no minimum, no lead time and no process detail published. But the cheaper honest answer comes first, because it is also usually the better one: a facility that cannot hold one of seven registers at a steady level for a year will not hold a bespoke one either, and the discipline is the product rather than the molecule. Custom label or logo on product is available if what you actually want is for the bottle behind the desk to carry your name.
And the honest limit on what a signature is worth. Ambient scent research supports improved evaluations of a space and its service, longer dwell and stronger recall, at moderate effect sizes. It is not a claim about admissions, bookings, referrals, package value, reviews or retention, and SOSA makes none of those.
- List your volumes by door, not by room, and mark which doors truly stay shut.
- Put the socket where the unit should stand, then put the unit there.
- Ask your engineers about undercuts, shared returns and supply airstreams.
- Walk to the closed clinical door with a fresh nose, and re-walk yearly.
What a signature actually is, and the register that will carry one for years
If one room is going to carry your signature for three years, choose the register for endurance rather than for first impression. A family lounge is a long-dwell room and a signature is a long-run commitment, so the property you want is transparency - a register that sits underneath other things rather than coming out to meet them.
The seven registers of the water-based Hotel Collection are each SOSA's own hotel-inspired interpretation, and SOSA is independent and not affiliated with, endorsed by or connected to any hotel brand. White Tea Serenity - white tea, aloe and cedar - is clean, weightless and spa-like, and it is the most transparent thing in the collection, which makes it the natural signature for a room people sit in for hours. Quiet Luxury - white tea, bergamot and cedar - is hushed and polished and is the safest single decision for a mixed public; it is also the better choice if the same register has to work in a reception as well as the lounge, because the bergamot gives it a little more at a threshold. Forest Suite - cedarwood, vetiver and green leaves - is grounding and green, reads as structural rather than decorative, and is the right signature for a premium lounge with timber, stone or real planting in it.
Tea Garden - jasmine, green tea and white tea - is the least risky floral in the collection because the jasmine sits inside the tea rather than on top of it, and it is a legitimate signature for a softer, more residential family lounge, provided the level is set distinctly lower than you would set a white-tea register. Warm Welcome - citrus, floral and sandalwood - is a threshold register by design and does its best work in the first ten seconds, which makes it a better signature for an entrance than for a four-hour room.
Old-World Glamour - amber, violet and woods - and Lobby Bar - citrus, pepper and amber - are the two I would not run as a healthcare signature at any level. Plush in a clinical building is the character that reads as though something is being covered, and a lounge full of people with time on their hands is where that inference has longest to develop. An after-dark register in a room that does its most important work at seven in the morning is theatrical, and a theatrical register at a low setting is a quiet theatrical register rather than an appropriate one.
The level for a signature room follows the four-hour rule: set for the person who has been sitting there since before dawn, not for the person walking in, which means the door impression is almost imperceptible and that is correct. Write the register and the number on a card taped to the machine with the date and the name of the person allowed to change it, because a signature that drifts is not a signature.
And the rooms that carry no signature and no register, in any facility, at any price: pre-operative areas and holding bays, procedure and operating rooms, post-procedure and post-anaesthesia recovery, sterile and decontamination areas, clinical and drug storage, and clinical waste. Nothing - not a lower setting, not a subtler version of the lounge register - written on the drawing as a list of named rooms and owned by your clinical and infection-control leads.
| Scent | Why it suits the mood |
|---|---|
| Door undercut · check first, fix by distance | The deliberate gap under a door, there for airflow reasons and doing its job. It makes a shut door a partial separator rather than a seal. At a low level and with the unit placed well inside the lounge, it rarely produces anything detectable at a boundary door several metres on - and it is the first thing to look at when a verification walk fails. Never seal or obstruct one to hold fragrance. |
| Shared return grille · invisible on the drawing | Two rooms that look separate can be served by the same return path, so air leaving the lounge travels a route it shares with the space next door. If the lounge holds its register well but somewhere unrelated smells faintly of it, this is usually why. Only the people who designed or maintain the air handling can tell you, which is why the plan goes to them before anything is bought. |
| Corridor acting as a plenum · the reason for the placement rule | In some buildings the corridor is part of the air path rather than a neutral gap. A unit standing in it, or a lounge discharging into it, is then connected to everything that corridor serves. This is the whole reason the machine goes in the lounge and never in the corridor between zones, however convenient the socket out there happens to be. |
| Unit in a supply airstream · entirely avoidable | A diffuser placed under or in front of a supply vent stops scenting a room and starts feeding a duct, distributing fragrance wherever that system sends it. It is common because the spot under the vent is often the spot with the shelf. Look up before choosing the position, and have your engineers confirm it before anything is drilled into a wall. |
So the buying answer for a lounge that is going to carry a signature. Do the volume first: a 500 sq ft lounge at 12 ft is 6,000 cubic feet, about 170 cubic metres; a 600 sq ft lounge at 12 ft is 7,200 cubic feet, about 204 cubic metres; an 800 sq ft lounge at 12 ft is 9,600 cubic feet, about 272 cubic metres; a 1,000 sq ft premium lounge at 14 ft is 14,000 cubic feet, about 397 cubic metres. If the lounge is open to a reception you intend to hold on the same register, add them as one volume - 600 plus 400 sq ft at 12 ft is 12,000 cubic feet, about 340 cubic metres.
For most of those, the SOSA Sukoon at ₹1,899 running the water-based Hotel Collection from ₹299 is the whole purchase, with 100ml refills at ₹999 and the pack of seven 15ml bottles at ₹1,799 to audition registers in your own air over five days each. The SOSA Boond at ₹899 suits a small enclosed premium lounge, and the SOSA Megh at ₹3,499 with a 6 litre tank suits a lounge that runs from before dawn to the last discharge without anybody refilling in front of families.
The waterless SOSA Vaayu at ₹11,999 is the commercial answer where the connected scented volume is genuinely large, and it is the one to raise with your infection-control lead because of what it does not do: cold-air nebulising of undiluted oil, no water, no humidity, no wet residue. Approximately 1000 cubic metres of connected air, with SOSA's own copy also stating 2,000 to 3,000 sq ft scented evenly; 400ml tank; Bluetooth app and timer so the room is held only in the hours it is occupied; freestanding, wall or HVAC mount; DC 12V / 1A at 5W and mains powered, so it needs a live socket in the right place; CE, RoHS and SGS. 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 engineering decisions taken with your own HVAC consultant and are never ducted into air handling that serves a clinical zone. Two systems, not interchangeable: the ₹299 water-based bottle never goes into a Vaayu or an HVAC machine.
And the lowest-governance signature of all, which suits a premium lounge better than people expect: a SOSA reed diffuser from ₹749, with 130ml from ₹1,249, 300ml refills at ₹2,399 and 500ml at ₹3,499, lasting about 6 to 10 weeks. Mountain Breeze at ₹849 is Himalayan pine, sage and cedar and Morning Freshness at ₹749 is Malabar lemon, mint and eucalyptus. A reed has no plug, no noise, no dial to drift and nothing to switch off, and it does not travel far from where it stands - which in a building where the whole design depends on scent staying in one room is a genuine argument rather than a consolation.
Three places to go next, all inside this section. For which patient rooms qualify at all, the two-question test is in should patient waiting areas in a day-surgery centre have ambient fragrance. For whether the two rooms should carry different characters, read should attendant waiting lounges be scented differently from patient areas. And for the level that a signature room should actually run at, the four tests and the four-hour rule are in how subtle fragrance should be in a healthcare waiting lounge.
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, and no price, minimum, lead time or process detail for bespoke composition. Send the plan, the ceiling heights, the door positions and the fragrance-free room list to WhatsApp at +91 96192 18531. Bulk orders are welcome and custom label or logo on product is available.
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.