Take the two familiar options honestly first, because both have a real argument.
One machine on one connected volume gives you one consistent result. One register, one setting, one card taped to one machine, one person responsible, and a front of house that reads the same at the door as it does at the seating group because it is literally the same air. Its limitation is absolute and physical: it stops dead at every closed door. Whatever the coverage figure says, a machine cannot push scent through a shut door, so anything on the far side of one is simply not covered, and no amount of turning it up changes that - it only over-doses the room the machine is standing in.
Several smaller units solve exactly that problem: they reach separate areas that are not connected to each other, which is a real thing to need in a large centre with a lobby here and a first-floor lounge there. What you buy with them is three problems you did not have before. Several settings that drift apart over months. Several people who might adjust them, none of whom knows what the others did. And a seam wherever two scented areas meet - a corridor, a lift lobby, a doorway - where two differently-dosed bodies of air mix into something neither of them was meant to be.
Then the third option, which this page will argue for. Scent the one connected public volume that matters, properly and at one setting, and write deliberate zeroes against everything else - not as a compromise, but because the rest of the building is the clinical half and the honest answer for the clinical half is nothing. There is no zoning problem to solve because there is only one zone. That is not a cheaper version of the right answer. In a facility with a surgical zone, it is the right answer, and everything on this page is about the public areas only. 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 engineering, and their decision overrides every recommendation here.
What does multiple zones actually cost compared with one machine? Three Sukoon units at ₹1,899 each is ₹5,697 of hardware against one Vaayu at ₹11,999 - so on the sticker, several small units look cheaper, and for two or three genuinely separate small rooms they often are. The cost that does not appear on the invoice is operational: three fragrance stocks, three settings to keep aligned, three machines somebody has to check, and three chances for a well-meaning supervisor to change something. In a hospital, where consistency is most of the point, that is the expensive half.
How do I know if my front of house is one connected volume or several? Walk it with every door in its normal state and ask at each opening whether it is usually open or usually shut. Entrance into lobby into reception into a seating group with no doors between them is one volume, and you size one machine for the whole of it: 2,000 sq ft at 14 ft is 28,000 cubic feet, about 793 cubic metres. A lounge behind a door that stays closed is a different volume and a different decision. A closed door ends one connected body of air and begins another, and in a healthcare building that mechanism is what makes a scented public half and a fragrance-free clinical half deliverable rather than aspirational.
So do this before pricing anything. Walk your front of house with a floor plan and a pen, and at every opening between one space and the next, write down whether the door is normally open, normally shut, or absent. Then draw a line around everything that is joined to everything else by an opening that is normally open or absent. That outline is your volume. Entrance to lobby to reception to billing to a seating group, with no doors in between, is one volume, however many names those areas have on the drawing, and it takes one machine. A lounge on the other side of a door that stays closed is a second volume, and it is a second decision - not automatically a second machine.
Then do the arithmetic for the volume you outlined, by hand, and state the ceiling height. A 2,000 sq ft connected front of house at a 14 ft ceiling is 2,000 x 14 = 28,000 cubic feet, and 28,000 divided by 35.3 is about 793 cubic metres. A 3,000 sq ft connected public floor at 12 ft is 36,000 cubic feet, about 1,020 cubic metres. A 1,200 sq ft double-height entrance at 20 ft is 24,000 cubic feet, about 680 cubic metres. Those numbers are the input to the buying decision. The room count is not.
Now the actual comparison. One machine is the right architecture when your outlined volume is one shape and everything you care about is inside it. You get one register at one level, one card taped to one machine, one person who owns it, and - the underrated part - one thing to get wrong instead of three. The limitation is that it will not serve anything behind a shut door, and you must accept that rather than try to defeat it by turning the setting up. Turning it up does not push scent through a door; it just over-doses the room the machine is in, which in a hospital is the failure that gets noticed.
Several units is the right architecture when you genuinely have two or three separate public volumes that all matter and that are not joined - a ground-floor lobby and a first-floor attendant lounge behind a fire door, say. What you must go in knowing is that you have bought an operational problem alongside the hardware. Settings drift: in six months one unit is higher than the others because somebody adjusted it on a busy day. Responsibility diffuses: three machines with no named owner is three machines nobody checks. And the seam appears: where two scented areas meet in a corridor or at a lift lobby, you get a mixture that neither setting intended, and it is always the corridor - the space nobody was scenting - that ends up smelling the strongest.
And then the third option, which is the one I recommend to most large private healthcare centres and which resolves the question rather than splitting it. One unit in the public volume, deliberate zeroes everywhere else. Not "we could not afford more". Not "we will phase it". A written plan that says: this connected public volume is scented at this register and this setting, and these named areas - pre-operative, procedure and operating rooms, post-procedure and post-anaesthesia recovery, sterile and decontamination, clinical and drug storage, clinical waste, and the corridors serving them - are fragrance-free by design. There is no zoning problem in that plan because there is only one zone. The thing that makes multi-zone scenting complicated in a hotel simply does not arise here, because the half of the building that would have needed the second and third machine is the half that gets nothing.
That is the whole argument, and it is worth noticing that it makes the sale smaller rather than larger. A portion of every SOSA order supports girl-child education through Nanhi Kali.
The commonest version of this question I get is phrased as a capacity problem - "my centre is 8,000 sq ft, is one Vaayu enough?" - and the answer almost never depends on the 8,000. It depends on how much of that 8,000 is public, whether the public part is joined, and how tall it is. A 8,000 sq ft centre with a 1,000 sq ft lobby at 12 ft has 12,000 cubic feet of scentable air, about 340 cubic metres, and 7,000 sq ft of building that is not part of the conversation. The lease number is the least informative figure in the discussion.
The second commonest is the phased plan: buy one now, add units later as budget allows. It sounds prudent and it usually produces the worst outcome of the three architectures, because the units arrive months apart, get set by different people against different memories, and nobody ever goes back and aligns them. If you are going to run more than one unit, commission them together, set them together, and write both settings on the same sheet of paper on the same afternoon.
The third is a governance point. Every additional machine is an additional thing that can be moved, adjusted, unplugged for a repaint, plugged back in somewhere else, or replaced by a well-meaning supervisor with something bought locally. In a building where the whole proposition rests on a boundary being respected, the number of movable fragrance sources in the building is itself a risk, and fewer is better. One machine in one place with one written setting is not just cheaper - it is easier to defend in the meeting where somebody asks how you know the recovery area is unaffected.
And the check that decides the level regardless of architecture: judge from the doorway on a Monday morning in a building that has been shut since Saturday, not from behind the desk on a Friday evening. Ask three people who have just come in off the street what they notice, before you tell them a diffuser exists. If two of the three can name a product, come down a notch. If a member of staff or a visitor tells you they react to fragrance, "off" must be a state anybody on the desk can set for a named unit without going to find a manager.
Three architectures, costed, with the trade-off each one makes
There are only three things that decide the architecture, and cost is not the first of them. The first is how many connected volumes you are actually scenting, which is a question about doors rather than about rooms or square feet. The second is who will run it in month nine, because every machine you add multiplies the chances of drift and the seam risk. The third is where the boundary sits, and in a healthcare building this is the factor that collapses the question: if the only opportunity is the public half, then the zoning exercise that makes this a hard question in a hotel or a mall never begins.
What does not decide it is the total floor area on the lease, the number of rooms on the drawing, or a coverage figure read in isolation. Every coverage rating you will ever see, including SOSA's, assumes one connected body of air. The Vaayu 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. Read that as a ceiling on one volume, not as a promise about a building. Two 500 cubic metre rooms separated by a closed door are not one 1000 cubic metre job. They are two jobs, and one machine will do the first one very well and the second one not at all.
It is worth being clear about what "large private healthcare centre" usually means physically, because it changes the answer. Often it means a substantial ground-floor public area - entrance with automatic doors, a lobby, a reception and billing counter, a pharmacy or diagnostics desk, and a seating group, all joined with no doors between them - plus a great deal of building behind and above it that is consultation, day-care beds, procedure rooms and recovery. The public part is large in floor terms but it is one shape. That is the single most important fact in the sizing exercise, and it is why the honest recommendation in a big centre is so often one machine rather than four.
One last framing before the detail. There is a temptation, in a building that has cost a lot to fit out, to treat scenting as a system to be engineered across the whole property, in the way lighting and music are. Resist it here. Lighting and music are needed in the clinical half and fragrance is not, so the analogy breaks at exactly the point where it matters. The correct mental model for a day-care hospital is not "a building-wide system with exclusions". It is "one room that gets something, and a building that does not".
It is also the architecture that fails most gracefully. If the level is slightly wrong, it is slightly wrong everywhere and one adjustment fixes it. In a multi-unit installation, a level that is wrong in one place is right in another, and the person adjusting it is standing in only one of those places.
Now the limitation, stated without softening it. A machine cannot push scent through a closed door. Not at a higher setting, not with a bigger machine, not with better placement. A shut door ends one connected body of air and begins another, and the far side is a separate problem with a separate answer. This is the fact that catches people out when they read a coverage figure as if it described a building: approximately 1000 cubic metres of connected air is a statement about one volume, and the word doing the work is "connected".
So the practical test for whether one machine is your architecture is a walk, not a calculation. Go to your front of house at a normal time of day and look at every opening between one space and the next. Is that door normally open, normally shut, or absent? Draw your outline around everything joined by an opening that is open or absent. If the whole of what you care about falls inside one outline, one machine is your answer, and you now have a volume to size against rather than a floor area to guess with.
Do the arithmetic by hand, and say what ceiling you assumed, because in a healthcare building it varies more than anywhere else - lobbies are commonly 10 to 14 ft, and a designed double-height entrance can be 16 to 20 ft. A 2,000 sq ft connected front of house at 14 ft is 28,000 cubic feet, about 793 cubic metres. A 3,000 sq ft public floor at 12 ft is 36,000 cubic feet, about 1,020 cubic metres, which is already at the edge of a single Vaayu. A 1,200 sq ft double-height entrance at 20 ft is 24,000 cubic feet, about 680 cubic metres for a footprint that looks modest on the drawing. A 1,500 sq ft lobby and reception at 12 ft is 18,000 cubic feet, about 510 cubic metres. A 1,000 sq ft lobby at 12 ft is 12,000 cubic feet, about 340 cubic metres.
Set those against the range and the sizing is mechanical. Up to a few hundred cubic metres of joined public space, an ultrasonic is usually the whole purchase - a Boond at ₹899 for a small enclosed front desk, a Sukoon at ₹1,899 for a normal reception and billing area, a Megh at ₹3,499 where a big lounge runs twelve hours a day and somebody would otherwise be refilling at lunchtime, all running the water-based Hotel Collection from ₹299. Around 500 to 1,000 cubic metres of genuinely connected, open, often double-height front of house is where the waterless Vaayu at ₹11,999 starts to be the correct answer rather than an aspirational one.
And one placement rule that belongs to this architecture specifically, because with one machine the placement carries everything. Put it inside the volume you intend to scent, facing into it, away from the corridor that leads to the clinical half and away from any return grille. Not in the corridor because that is where the free socket was - that is the commonest physical mistake in this whole category, and in a hospital it is the one with consequences, because a machine in a corridor is dosing the corridor and testing every door off it. Have your own facilities engineers confirm the position before anything is drilled or ducted, and never place or duct a unit into air handling that serves a clinical zone.
What has to be said honestly is what else arrives with the second and third machine, because suppliers rarely mention it and it is the half that determines whether the installation is still right a year later.
Settings drift apart. Three machines set identically in March are not set identically in September. One gets nudged up during a busy week and never comes back down. One gets unplugged for a floor polish and comes back on its factory default. One is in a smaller room than the person adjusting it remembered. Nobody does anything wrong; the drift is emergent. The countermeasure is a written record - register, setting and physical position for every unit, on one sheet, reviewed on a date - and a card taped to each machine. It works, and it only works if somebody owns it.
Several people can adjust them. This is the real problem behind the first one. A single machine in a lobby has an obvious owner. Four machines spread across a centre belong to whoever is nearest, which is a different person on each floor and a different person at the weekend. In a building where the entire proposition rests on a boundary being respected, every additional adjustable fragrance source is an additional thing that can move, be turned up, or be supplemented by something bought locally and put on a shelf.
And there is a seam. This is the part people do not anticipate. Wherever two scented areas meet - a corridor between two lounges, a lift lobby, an open doorway between a reception and a waiting area - the two bodies of air mix. Neither setting was chosen for that mixture. The reliable result is that the in-between space, which nobody was trying to scent, reads stronger than either of the rooms that were. If somebody tells you the corridor smells more than the lobby, you almost certainly have a seam rather than a leak.
The seam also matters for a hospital-specific reason. Corridors in a day-care hospital are frequently the route to the clinical half, so the one space where a multi-unit plan concentrates fragrance is the space you least want it in. That alone is enough to make me cautious about multi-zone plans in this vertical, quite apart from the operational mess.
So if you do go multi-unit, do it properly. Commission every unit on the same afternoon rather than phasing them in over months. Run the same register in all of them, at different levels according to each volume - never different registers, because a building that changes character as you walk through it reads as uncoordinated and pulls attention onto the fragrance as a decision. Leave the connecting spaces deliberately unserved and check them, because they are where the evidence of a problem shows up first. Write it all down. And accept that you have taken on a maintenance commitment rather than bought a product.
On cost, so nothing is hidden: three Sukoon units at ₹1,899 each is ₹5,697 of hardware, against one Vaayu at ₹11,999. On the sticker, several small units are cheaper, and for two or three genuinely separate small public rooms they are often the honest answer. What the sticker does not show is three fragrance stocks to keep aligned, three machines somebody has to physically check, and three opportunities per year for the plan to drift. That is the cost that decides whether the installation is still right in year two, and it is why I would rather sell one machine well-placed than three scattered.
The public half - entrance, lobby, reception, billing, consultation waiting, the patient lounge and the attendant or family waiting area - is the whole of it, and it is a real opportunity. The clinical half - pre-operative areas, procedure and operating rooms, post-procedure and post-anaesthesia recovery, sterile and decontamination areas, clinical and drug storage and clinical waste - gets nothing. Not a lower setting. Not a subtler register. Nothing.
Put those two facts together with the walk you did in factor one and something useful happens. The volume you outlined - the joined public front of house - is very often a single shape. Everything else is either behind a door that stays shut for reasons that have nothing to do with fragrance, or on the "nothing" list, or both. So the zoning problem disappears. There is one zone. You buy one machine for it, you set it once, you write it down, and the rest of the building is covered by a list of named areas that are fragrance-free by design.
That plan has properties the multi-zone plan does not. It is cheaper, obviously. It is more consistent, because one setting cannot drift away from another setting. It has one owner. It has no seam, because there is no second scented area to meet. And - this is the one that matters most in a hospital - it is far easier to defend. When your infection-control lead or your facilities engineer asks how you know the clinical zone is unaffected, "there is one machine, it is here, it is set at this number, and here is the list of areas with nothing in them" is an answer. "There are four machines around the building" is the beginning of a longer meeting.
Write the zeroes with the same care you write the yes. Named rooms on the same drawing that carries the scenting plan, not a principle in somebody's head, because a principle gets reinterpreted by whoever is on shift in month seven and a list on a drawing does not. Include the corridors that serve the clinical half. Include any area your clinical leads add, and treat the list as theirs to extend.
Two honest caveats, so this does not read as a slogan. First, the third option is not always right. If you genuinely have two separate public volumes that both matter - a large ground-floor lobby and a first-floor attendant lounge behind a closed door, both busy, both part of the experience - then two units is the correct architecture and you should buy two, commission them together and write both down. The third option is the default, not a rule. Second, none of this is an engineering assessment of your building. Whether your public volume and your clinical zone are genuinely separate bodies of air, how your air handling is arranged and what any given air handler serves are questions for your own HVAC consultant and facilities engineers. A scenting unit is never placed in or ducted into air handling that serves a clinical zone. And whatever the engineering says, the decision about what may be introduced into the air of a building with a surgical zone belongs to your clinical leadership and infection-control policy, whose answer can be no - which is a complete and legitimate outcome, and one I would rather accept than argue past.
And under no circumstances is the answer to any coverage shortfall to reduce ventilation, close a vent or turn down extraction so the fragrance holds longer. A well-ventilated healthcare building is genuinely harder to scent, and the honest response is a correctly sized machine in a correctly chosen place at a low setting - never less air.
- Walk the front of house and mark every door as normally open, normally shut or absent.
- Outline everything joined by an open or absent opening - that is your volume.
- Do the arithmetic for that outline and state the ceiling height you assumed.
- Write the fragrance-free areas as named rooms before you price a single machine.
One register across the whole public volume, and the seam you avoid by not creating one
Whichever architecture you choose, run one register across the whole public volume. This matters more in a multi-unit installation than a single-machine one, and it is the rule people are most often tempted to break, because once you own three machines it feels natural to give each area its own character.
Do not. A building that smells of white tea in the lobby and something green in the lounge does not read as considered; it reads as uncoordinated, and worse, it pulls the visitor's attention onto the fragrance as a decision somebody made. The whole target in a hospital is the opposite - air that is received as part of the building rather than as a product. One register at different levels according to volume and dwell is the correct arrangement. Different registers in different rooms is how a seam becomes a smell people can describe.
The healthcare steer on which register is narrower than for any other commercial vertical, and it is a context judgement rather than a taste one: clean and unsweet reads right here, because a sweet or plush character over a warm enclosed room reads as covering something rather than as generosity, and in a clinical building that inference is already half-formed before anybody walks in.
White Tea Serenity - white tea, aloe and cedar - is clean, weightless and spa-like, and it is the register that most naturally reads as clean rather than as scented. Quiet Luxury - white tea, bergamot and cedar - is hushed and polished, the same idea with a little more lift at a threshold, and the safest single decision in the collection for a very mixed public. Forest Suite - cedarwood, vetiver and green leaves - is grounding and biophilic green, and it is the right answer where the front of house has timber, stone or real planting; it reads as structural rather than decorative, which is an advantage in a room where thirty strangers are waiting.
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, though it is a step warmer than the white-tea registers and wants a lower setting. Warm Welcome - citrus, floral and sandalwood - is warm and gracious, a genuine threshold register for a family-facing facility, and it must be run at a fraction of what a hotel would use. Old-World Glamour - amber, violet and woods - is plush and evening-elegant and the wrong shape for a clinical building. Lobby Bar - citrus, pepper and amber - is bold, playful and after-dark, and it has no home in a day-care hospital at any setting.
All seven are SOSA's own hotel-inspired interpretations, and SOSA is independent and not affiliated with, endorsed by or connected to any hotel brand. These seven are the water-based Hotel Collection for the SOSA ultrasonics; the Vaayu and the ducted machines run four hotel-inspired waterless blends supplied with the machine as one of three bundle choices. Two different fragrance systems, not the same bottle in two sizes - which is worth knowing before you build a multi-unit plan mixing an ultrasonic in one room with a Vaayu in another, because the fragrance stocks are not shared. And I will not rank the seven against each other on measured throw or longevity: SOSA does not publish that comparison, and connected volume, ceiling height, ventilation, door traffic and setting swamp any difference between blends.
The areas that get no register at all, in any architecture: pre-operative areas, procedure and operating rooms, post-procedure and post-anaesthesia recovery, sterile and decontamination areas, clinical and drug storage, and clinical waste - along with the corridors that serve them.
| Scent | Why it suits the mood |
|---|---|
| One machine, one connected volume · consistency | One register, one setting, one card, one owner, and a front of house that reads the same throughout because it is the same air. It stops dead at every closed door, and turning it up does not change that - it only over-doses the room the machine stands in. Size against the volume: 2,000 sq ft at 14 ft is 28,000 cubic feet, about 793 cubic metres. Sukoon ₹1,899, or Vaayu ₹11,999 where the volume is genuinely large. |
| Several smaller units · reach, at a price that is not on the invoice | The right answer when you truly have two or three separate public volumes that all matter. Three Sukoon units at ₹1,899 is ₹5,697 of hardware. What comes with it: settings that drift apart over months, several people who might adjust them, and a seam wherever two scented areas meet - usually a corridor, which then reads stronger than either room. Commission them together, run one register at different levels, and write every setting down. |
| One unit and deliberate zeroes · the usual answer here | Scent the one connected public volume properly; write the clinical half as a list of named fragrance-free rooms. No zoning problem, because there is one zone. Cheaper, more consistent, no seam, one owner - and far easier to defend when somebody asks how you know the clinical areas are unaffected. This is the design, not the compromise. |
| Whole-building ducted scenting · an engineering decision, not a purchase | Aangan ₹25,999 covers approximately 8,000 to 10,000 sq ft and Meenar ₹38,500 approximately 12,000 to 18,000 sq ft, both ducted into HVAC. In a healthcare building this is decided by the facility's own HVAC consultant and never by a page, and a scenting unit is never placed in or ducted into air handling that serves a clinical zone. |
So the buying answer, in the order I would actually work through it. First, outline the connected public volume and do the arithmetic. If it comes out at a few hundred cubic metres - a 1,000 sq ft lobby at 12 ft is 12,000 cubic feet, about 340 cubic metres, and a 1,500 sq ft front of house at 12 ft is 18,000 cubic feet, about 510 cubic metres - an ultrasonic is very often the whole purchase. The SOSA Boond at ₹899 suits a small enclosed front desk; the SOSA Sukoon at ₹1,899 suits a normal reception and billing area; the SOSA Megh at ₹3,499 with its 6 litre tank suits a large lounge that runs from seven in the morning to eight at night without anybody wanting to refill at lunchtime. All three run 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 rather than choosing from a description.
Second, if the outlined volume is genuinely large - an open double-height entrance running into reception, billing and a seating group as one shape, in the region of 500 to 1,000 cubic metres - the waterless SOSA Vaayu at ₹11,999 is the commercial answer for one volume rather than three small machines scattered across it. It 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. It takes a 400ml tank, mounts freestanding, on a wall or into HVAC, runs on DC 12V / 1A at 5W so it needs a live socket, and carries CE, RoHS and SGS. The Bluetooth app and timer are worth more in a healthcare building than anywhere else, because they let one machine run your OPD hours and nothing else. And its defining argument in a hospital is what it does not do: waterless cold-air nebulising of undiluted oil, so no water, no humidity and no wet residue in a building that has a surgical zone in it. It is 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 cannot travel through a closed door.
Two systems, and they are not interchangeable, which matters more in a multi-unit plan than anywhere else: the ₹299 water-based bottle never goes into a Vaayu or into Aangan at ₹25,999 or Meenar at ₹38,500. If you run an ultrasonic in one room and a Vaayu in another, you are running two fragrance stocks, and holding one register consistently across both is a conversation to have before you buy rather than after. Ducted scenting in a healthcare building is an engineering decision taken with your own HVAC consultant, never a page's decision, and never into air handling that serves a clinical zone. Where you want no plug, no noise and nothing to switch off at a small counter, the SOSA reed diffusers are a separate set of registers from ₹749 lasting about 6 to 10 weeks, with Mountain Breeze at ₹849 and Morning Freshness at ₹749 sitting closest to a healthcare desk.
To go further into the parts this page touches only briefly: if your centre runs over several floors and the question is really about vertical separation, the stairwell-and-lift-shaft argument is in how to approach ambient scenting in a multi-floor day-surgery facility. If your instinct is to cover a large lobby with several passive sources instead of one machine, the arithmetic that explains why that fails is in why multiple reed diffusers still struggle to cover a large hospital reception. And if what you actually want to know is whether an active machine is justified at all yet, the honest case including "not yet" is in when active waterless scenting like SOSA Vaayu makes sense for a day-care hospital.
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. Send your plan, your ceiling heights, which doors stay shut and your marked fragrance-free list to SOSA on WhatsApp at +91 96192 18531. 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.