What actually decides it is connected public volume - floor area multiplied by ceiling height, stopping dead at any door that stays shut - and then two questions that have nothing to do with size at all: do you need the room to smell the same every time, and do you need it to follow your OPD hours.
A reed diffuser has exactly three real limits, and none of them is square footage. Its level drifts downward across its life as the bottle empties, so the room you set in week one is not the room you have in week eight. It cannot follow your hours, because there is nothing to switch off - it runs at three in the morning into a closed building exactly as it runs at nine. And it is a passive source with no pressure behind it: evaporation from a few reeds relies on the room's own air to move anything anywhere, so in a lobby where automatic doors are cycling and the air conditioning is running it will not cross the floor. Those three limits bite at 300 sq ft and at 3,000 sq ft. What changes with size is only how obvious they are.
So this page does the arithmetic by hand across several real receptions, gives you an honest practical band rather than a hard line, and is entirely willing to end with "your reed is fine, buy a second bottle and spend the money on the seating instead". And all of it is about the public half of your building only: pre-op, procedure, recovery, sterile areas and clinical storage get nothing at all, and what may be introduced into the air of a facility with a surgical zone is decided by your own clinical leadership, infection-control policy and facilities engineers.
What are the actual limits of a reed diffuser in a hospital lobby? Three, and none of them is size. The level drifts down as the bottle empties across its roughly 6 to 10 week life, so week one and week eight are different rooms. It cannot follow OPD hours, because there is nothing to switch off. And it is a passive source with no pressure behind it, so in a lobby with automatic doors cycling and air conditioning running it will not cross the floor. If any of those three matter to you, size is irrelevant - you need a machine.
What do I buy instead, and what does it cost? For a single enclosed reception, the SOSA Sukoon at ₹1,899 running the water-based Hotel Collection from ₹299 is usually the whole purchase. For a large, open or double-height front of house that has to run on a timer all day, the waterless SOSA Vaayu at ₹11,999 is rated for approximately 1000 cubic metres of connected air. Plenty of facilities genuinely need neither.
Take the volume first, because it is the part people came for. Do it by hand: floor area multiplied by ceiling height gives cubic feet, and cubic feet divided by 35.3 gives cubic metres. A 300 sq ft reception at 12 ft is 300 x 12 = 3,600 cubic feet, and 3,600 / 35.3 is about 102 cubic metres. A 600 sq ft reception and billing area at 12 ft is 600 x 12 = 7,200 cubic feet, about 204 cubic metres. The same 600 sq ft as a double-height entrance at 18 ft is 600 x 18 = 10,800 cubic feet, about 306 cubic metres - three times the first room for a footprint only twice as big, which is exactly why floor area is such a poor guide in a hospital. A 1,000 sq ft lobby at 12 ft is 1,000 x 12 = 12,000 cubic feet, about 340 cubic metres.
Against those four numbers, the honest band is this. Below roughly 100 to 150 cubic metres of connected public air, in a room with a door that actually stays shut and traffic that is not continuous, a reed diffuser is a real answer rather than a compromise - it is doing a job it can do. Somewhere around 200 cubic metres and beyond, a reed becomes a thing you can smell when you are standing next to it and nothing at all across the room, which is not scenting a reception; it is scenting a console table. And the moment the ceiling goes double-height, treat the reed as decorative regardless of the floor plan, because 306 cubic metres of air will not be moved by evaporation from five sticks.
That band is deliberately a band. I will not give you 480 sq ft as a line, because the same 480 sq ft with the entrance doors twenty feet away and opening forty times an hour behaves nothing like 480 sq ft in a quiet side reception behind a door, and any number precise enough to quote is precise enough to be wrong.
Now the two requirements, which are the part that actually settles most facilities. Do you need repeatability? A reed's level is not constant - it is at its strongest when the bottle is full and it declines as the bottle empties across its roughly 6 to 10 week life, so the attendant who sat in your lounge in week two and comes back in week nine meets a different room. If your whole reason for doing this is that the building should read the same every time, a reed is structurally the wrong tool, at any size. And do you need hours control? A reed has no timer, no app and no off switch. It runs into a closed building all night and all Sunday. A machine with a timer scents your OPD hours and stops, which in a healthcare building is not a luxury feature but the difference between a considered decision and a thing that is simply always happening.
If you need neither - a small enclosed reception, modest traffic, and presence rather than precision is the brief - then buy the reed, and be pleased about it. A portion of every SOSA order supports girl-child education through Nanhi Kali.
Here is the test I would actually run, and it costs nothing. Stand at the far corner of the room from wherever the reed is, at nine in the morning, in a building that has been shut overnight, and breathe. Not next to it - at the far corner. If you get nothing there, the reed is not scenting that room; it is scenting its own metre of air and you have been judging it from inside that metre. That single walk tells you more than any size rule, and it is the reason so many facilities believe their reed "stopped working" when what actually happened is that it never worked at that distance and nobody checked.
Then do the same walk in the afternoon, when the automatic doors have been cycling since eight. The reed will be fainter still, and this is where people reach for a bigger bottle. A bigger bottle is not the fix. A 300ml refill at ₹2,399 or a 500ml at ₹3,499 gives you more reed, for longer, in the same physics - it does not give the reed pressure it does not have. A passive evaporative source cannot push against an air change, and a hospital entrance is an air change.
The commonest mistake in this whole question is an arithmetic one rather than a judgement one: people size on floor area and forget the ceiling. Hospital lobbies are commonly 10 to 14 ft and a purpose-built entrance can be 16 to 20 ft. A 600 sq ft footprint is 7,200 cubic feet at 12 ft and 10,800 at 18 ft, about 204 and about 306 cubic metres, and those two rooms need completely different answers despite looking identical on a drawing. Say which height you assumed, every single time.
And the second commonest is an honest confusion about what you are buying. If your reception smells of the housekeeping round, of the corridor, or of a building that was closed all weekend, no reed and no machine will fix it, because fragrance adds scent and does not remove odour. Source first, then ventilation, then cleaning, then scent. A facility that does the first three properly needs less of whatever it buys fourth.
What actually decides it - and it is not the floor area
Three things decide whether a reed diffuser is still the right purchase for your reception, and the floor area is at best the third of them. The first is what a reed physically is and therefore what it cannot do - three specific limits that are properties of the object rather than of your building. The second is the connected air volume you are actually asking it to fill, which is arithmetic and takes ten seconds. The third is the pair of operational requirements - repeatability and hours control - that override the other two entirely whenever they apply.
What does not decide it is any published comparison of how far a reed throws against how far a machine throws, because that comparison does not exist in any form that survives contact with a real lobby. SOSA does not publish one and this page will not invent one. What SOSA does publish about reeds is what is on the product pages: five registers from ₹749, 130ml from ₹1,249, 300ml refills at ₹2,399 and 500ml at ₹3,499, and a reed lasting about 6 to 10 weeks. Everything else about how a reed behaves in your particular room is yours, and the only honest way to find out is the far-corner walk in the paragraph above.
It is worth being clear about what "stronger" means in the question, because the word is doing unexamined work. People say stronger and mean louder. What they usually need is not louder at all - it is steadier, or further, or controllable. Those are four different requirements and only one of them is about intensity. A machine is not primarily a louder reed. It is a source with pressure behind it, a constant output rather than a declining one, and a switch. If you buy a machine expecting volume, you will set it too high on day one and spend three months undoing that.
And one framing that changes the whole decision, because in healthcare it is the honest hierarchy. A reed is not the cheap option that you graduate out of. It is a genuinely correct answer for a particular kind of room - small, enclosed, moderate traffic, no plug wanted, nothing to switch off, nobody to train - and a great many day-care hospitals should stay on one permanently. The page you are reading is not trying to move you up a range. It is trying to stop you buying a ₹11,999 machine for a room that a ₹749 bottle was already handling, and equally to stop you putting five reeds in a double-height entrance and concluding that ambient scenting does not work.
A reed diffuser is a bottle of fragrance oil with porous sticks standing in it. The oil wicks up the reeds, reaches the exposed surface, and evaporates into whatever air happens to be touching it. That is the entire mechanism. There is no fan, no pump, no nebuliser, no pressure, no timer and no switch. It is a passive evaporative source, and every one of its limits follows from that single fact.
Limit one: the level is not constant, and it drifts downward. A full bottle presents the most oil to the most reed surface, and as the bottle empties over its roughly 6 to 10 week life the rate falls away. So the room in week two and the room in week eight are genuinely different rooms, and the decline is gradual enough that nobody inside the building notices it happening. What they notice is an abrupt judgement in about week seven - "it has stopped working" - followed by somebody buying a bigger bottle or adding a second one next to it, which restores it for a fortnight and then repeats. If your entire reason for scenting the public half is that a returning family should meet the same building, a source whose level is a function of how full the bottle is will not deliver that. This is not a criticism of reeds. It is what evaporation does.
Limit two: it cannot follow your hours. There is nothing to switch off. A day-care hospital is not a 24-hour building - most run a list from early morning to early evening and then close - and a reed runs all night into a shut, unventilated lobby and all through Sunday when the doors are locked. On Monday morning that closed-up air has been sitting on top of a reed for thirty-six hours, and the first patient through the door at seven meets the result. A machine with a timer produces the opposite behaviour: it scents the hours you are open and nothing else, so the lobby is right when the first list arrives and the building is not quietly being scented at three in the morning. In healthcare, that is not a convenience feature. It is most of the argument.
Limit three: there is no pressure behind it, so it will not cross a lobby. This is the one that surprises people, and it is the reason the far-corner walk matters. A passive source depends entirely on the room's own air movement to distribute anything. In a still room with a shut door, that is enough - the air is slow, the molecules have time, and over a few hours a small enclosed reception genuinely fills. A hospital entrance is the opposite of a still room. The automatic doors open for every arrival, every discharge, every attendant stepping out for tea and every delivery, which is a continuous partial exchange of the lobby's air with the street. The air conditioning is running and there is a return grille somewhere pulling air out of the room. Against that, evaporation from five sticks on a console table is not going to reach the seating twelve metres away, and no amount of extra bottles changes the physics - it changes how much scent exists in the metre around the table.
Say plainly what follows. Those three limits apply at 300 sq ft and at 3,000 sq ft. Size does not cause them. Size only determines how visible they are: in a small enclosed room you may never notice limits one and three, and limit two you may simply not care about. In a big open lobby all three are obvious within a week. That is the real relationship between size and reeds, and it is not a threshold.
And none of this is a claim about anything clinical. A reed diffuser is an ambient fragrance product for public areas, exactly as a machine is. Neither is a medical device, an infection-control product or an air-treatment device, neither removes odour, and neither belongs anywhere on the clinical side of the door - including, and I have seen this more than once, a reed that a well-meaning member of staff brought from home and put on a shelf in a recovery bay because the room looked bare.
A 300 sq ft reception at 12 ft. 300 x 12 = 3,600 cubic feet. 3,600 / 35.3 is about 102 cubic metres. This is a small front desk with a couple of chairs, and if it sits behind a door or set back from the entrance, a reed genuinely works here. It is inside the band where a passive source and a room of that size are matched.
A 600 sq ft reception and billing area at 12 ft. 600 x 12 = 7,200 cubic feet, about 204 cubic metres. Twice the air of the first room. This is the point where most facilities discover the far-corner problem: the reed is perceptible at the desk and absent at the seating, and both of those observations are correct. This is the honest middle of the band, and which way it goes depends on the door traffic and whether the space is enclosed.
The same 600 sq ft as a double-height entrance at 18 ft. 600 x 18 = 10,800 cubic feet, about 306 cubic metres. Identical on the floor plan, three times the air of the 300 sq ft room and half again the air of the 12 ft version of itself. A reed here is an object on a table. It is not scenting this room and it was never going to.
A 1,000 sq ft lobby at 12 ft. 1,000 x 12 = 12,000 cubic feet, about 340 cubic metres. Comfortably past any reed, and now genuinely a machine question - though note that 340 cubic metres is still only about a third of what a single Vaayu is rated for, which is the finding this bank keeps arriving at: the public half of a day-care hospital is a smaller volume than the building makes it feel.
Two further numbers for orientation, both worth having in your head. A 500 sq ft attendant lounge at 12 ft is 6,000 cubic feet, about 170 cubic metres - and this is the room where the reed question is most finely balanced, because a lounge is often enclosed and quiet, which favours a reed, but it is also the room with the longest dwell in your building, which favours the steadiness of a machine. An 800 sq ft connected front of house at 12 ft is 9,600 cubic feet, about 272 cubic metres.
So the band, stated as honestly as I can state it. Under roughly 100 to 150 cubic metres of connected public air, with an enclosed room and traffic that is not continuous: a reed is a real answer. Between roughly 150 and 200: it depends entirely on the doors, and you should do the far-corner walk before spending anything. Above roughly 200 cubic metres, or at any double-height ceiling, or wherever the entrance doors are cycling constantly: a reed is decorative and a machine is doing the work.
One thing that band does not do is tell you to buy up the range. At 340 cubic metres of connected public air the answer is very often a Sukoon at ₹1,899, not a Vaayu at ₹11,999. The step from reed to machine is a step in kind - a source with pressure, a constant output and a switch - and you take that step at ₹899 or ₹1,899. The step up to the Vaayu is a separate decision about scale, openness, double height and running all day on a timer without anybody touching it.
And whatever the arithmetic says, it never says to reduce ventilation so that the fragrance holds. A well-ventilated lobby is genuinely harder to scent than a sealed one, this page says that plainly rather than pretending otherwise, and the answer is placement, correct sizing and level - never closing a vent, never turning down extraction, never asking an engineer to slow an air change for a fragrance. In a healthcare building that trade is not available and should never be proposed.
Repeatability. The single strongest commercial argument for ambient scent in a healthcare building is that the public half reads the same on every visit. A family that sat in your lounge in March and comes back in September meeting identical air is what turns a register into a house character - and that repetition is free, it costs nothing to maintain beyond not fiddling with it, and it is the part of this that most facilities under-value. Ambient scent research supports improved evaluations of a space and its service, longer dwell and stronger recall, at moderate effect sizes; recall in particular is a function of consistency. It is not a claim about admissions, referrals, package value or fees, and SOSA does not make one. But if consistency is the mechanism, then a source whose output declines from the day you open the bottle is fighting you, and a machine that produces the same output on a written setting for as long as you leave it alone is the tool for the job. Write the setting on a card taped to the machine and the register becomes a standard instead of a mood.
Hours control. A day-care hospital opens early, runs a list, and closes. Between closing and opening it is a shut building with the air conditioning off. A reed does not know that. It carries on all night, so the air the first patient meets at seven in the morning has had a passive source sitting in it, undisturbed, since the previous evening - and that closed-up overnight character is a real phenomenon in hospital lobbies entirely separate from whatever you added to it. The Vaayu's Bluetooth app and timer exist precisely for this: you scent the hours you are open, the machine is off when the building is off, and the decision about when your lobby smells of anything becomes yours rather than the calendar's. If you want a single feature-based reason to move from reed to machine in healthcare specifically, that is the one I would give you, and it is independent of every square foot in the building.
There is a third requirement worth naming, quieter than the other two, and it is about people. A reed needs nobody. A machine needs somebody: a named person who knows what the setting is, who tops it up, who does not adjust it because a consultant mentioned it in passing on a Tuesday, and who switches it off without asking permission the moment a visitor or a member of staff says they react to fragrance. That last part is a standing arrangement rather than a favour. Anybody on the desk should be able to put a named unit into the off state without finding a manager first, and a reported reaction is a recalibration signal, not a tolerance problem. Your front desk, billing and housekeeping teams are in that air eight to ten hours a day and are the most exposed people in the building. If you do not have that named person and that standing arrangement, you are not yet ready for a machine, and the honest advice is to stay on the reed until you are.
So run the three questions in this order, and buy at the first yes. Does the level need to be the same in week eight as in week one? Does it need to stop when the building closes? Is the connected volume above roughly 200 cubic metres or the ceiling double-height? Any one yes means a machine. Three noes means you already own the right product, and the money is better spent on the seating, the wayfinding, the washroom extraction or the housekeeping schedule - all of which will do more for how your front of house reads than any upgrade in this category.
And the boundary, which sits above all of this and is not a size question at all. Whatever you conclude about reception, the clinical half gets nothing: pre-operative areas, procedure and operating rooms, post-procedure and post-anaesthesia recovery, sterile and decontamination areas, clinical and drug storage and clinical waste. Not a reed, not a lower setting, nothing. Your own clinical leadership, infection-control policy and facilities engineering decide what may go into the air of your building, they can extend that list, and they can rule the whole idea out - and if they do, that is the answer.
- Measure the connected public volume: floor area times ceiling height, worked by hand.
- Do the far-corner walk at nine in the morning before you spend anything.
- Ask whether you need repeatability and hours control, or only presence.
- If a reed still answers all three, buy the reed and spend the rest on seating.
Reed, ultrasonic or Vaayu - and which register in each
Register matters much less than the format question above, but it is not nothing, and the honest thing is that the reed range and the Hotel Collection are two different sets of registers rather than the same scents in two packages. If you move from reed to machine, you are changing what your lobby smells of, and you should choose deliberately rather than discover it.
The SOSA reed diffusers are five: Morning Freshness at ₹749 is Malabar lemon, mint and eucalyptus, the freshest and most obviously clean-reading of them and the one I would put at a small healthcare desk if you gave me one choice. Mountain Breeze at ₹849 is Himalayan pine, sage and cedar, which sits closest to the woody register a hospital front of house wants and agrees with timber and stone. Garden Bloom at ₹799 is British rose and night-blooming jasmine, a proper floral and a step warmer than either of those - workable in a softer, family-facing reception, and to be used with restraint. Evening Calm at ₹799 is Kashmir lavender and chamomile. And Fresh Brew at ₹849 is Coorg coffee and Kerala vanilla, which is a lovely thing in a home and the wrong shape for a hospital desk, because sweetness sitting over a warm enclosed room in a clinical building is precisely the character that reads as covering something.
The water-based Hotel Collection is seven, each SOSA's own hotel-inspired interpretation - and SOSA is independent and not affiliated with, endorsed by or connected to any hotel brand. For a healthcare reception the field narrows fast to three. White Tea Serenity is white tea, aloe and cedar: clean, weightless and spa-like, and the register that most naturally reads as clean rather than as scented, which is the exact distinction a hospital is trying to make. Quiet Luxury is white tea, bergamot and cedar, hushed and polished, and the safest single decision in the collection for a very mixed public. Forest Suite is cedarwood, vetiver and green leaves, grounding and green, and the right answer where the fit-out is stone, concrete, dark timber or has real planting in it.
Of the other four: Tea Garden is jasmine, green tea and white tea, with the jasmine sitting inside the tea rather than on top of it, which makes it the least risky floral for a softer front of house at a correspondingly lower level. Warm Welcome is citrus, floral and sandalwood, a genuine threshold register for a family-facing neighbourhood facility, run at a fraction of what a hotel would use. Old-World Glamour is amber, violet and woods, plush and evening-elegant, and it is the wrong shape for a clinical building for the same covering reason as Fresh Brew. Lobby Bar is citrus, pepper and amber, bold and after-dark, and it has no home in a day-care hospital at any setting - turning a theatrical register down makes it quiet, not appropriate.
What I will not do is rank any of these against each other on measured throw or longevity, in either range. SOSA does not publish that comparison, and the variables that dominate in your lobby - connected volume, ceiling height, ventilation rate, automatic-door traffic, soft furnishing and the setting you choose - are all yours rather than the blend's. Anybody claiming that one register "lasts twice as long" as another in a room they have never stood in is guessing at your expense.
| Scent | Why it suits the mood |
|---|---|
| A reed diffuser · under about 100-150 m3, enclosed | A 300 sq ft reception at 12 ft is 3,600 cubic feet, about 102 cubic metres - and with a door that stays shut and traffic that is not continuous, a reed from ₹749 genuinely does this room. No plug, no noise, nobody to train, nothing to switch off. Accept the two trade-offs honestly: the level declines across its roughly 6 to 10 week life, and it runs all night into a closed building. |
| SOSA Boond or Sukoon · the step in kind, not in size | ₹899 and ₹1,899, running the water-based Hotel Collection from ₹299 with 100ml refills at ₹999. This is where you go the moment repeatability or hours control matters, or when the far-corner walk comes back empty in a 600 sq ft room at 12 ft - 7,200 cubic feet, about 204 cubic metres. A source with pressure, a steady output and a switch. |
| SOSA Vaayu · large, open or double-height | ₹11,999, waterless cold-air nebulising, rated for approximately 1000 cubic metres of connected air. The answer for a 1,000 sq ft lobby at 12 ft - 12,000 cubic feet, about 340 cubic metres - or a 600 sq ft double-height entrance at 18 ft, which is 10,800 cubic feet, about 306. No water, no humidity, no wet residue, and a timer that scents your OPD hours and nothing else. |
| Nothing at all · the entire clinical half | Pre-operative areas, procedure and operating rooms, post-procedure and post-anaesthesia recovery, sterile and decontamination areas, clinical and drug storage, clinical waste. Not a reed, not a machine on a low setting - nothing. Write it as named rooms on the drawing, and treat your clinical and infection-control leads as the people who own that list. |
So the buying answer, in the order I would actually work through it. First, do the free work: source, then ventilation, then cleaning, then scent. If reception smells of the housekeeping round, of the corridor or of a building closed since Saturday, neither a reed nor a machine will fix that, because fragrance adds scent and does not remove odour.
Then the arithmetic and the far-corner walk. If you land under roughly 100 to 150 cubic metres in an enclosed room and you do not need steadiness or a timer, buy the reed: 130ml from ₹1,249, with 300ml refills at ₹2,399 and 500ml at ₹3,499, lasting about 6 to 10 weeks. That is a finished decision and not a stepping stone.
If any of the three questions came back yes, step to a machine. The SOSA Boond at ₹899 suits a small enclosed front desk and the SOSA Sukoon at ₹1,899 a normal reception and billing area, both running the water-based Hotel Collection from ₹299 with 100ml refills at ₹999; the pack of seven 15ml bottles at ₹1,799 is how you audition registers in your own lobby air rather than choosing from a description. If the attendant lounge is large and runs from early morning to evening without a break, the SOSA Megh at ₹3,499 and its 6 litre tank saves somebody refilling at lunchtime.
For a large, open or double-height front of house, the waterless SOSA Vaayu at ₹11,999 is the commercial answer, and in a hospital its defining feature is what it does not do: cold-air nebulising of undiluted oil, so no water, no humidity and no wet residue anywhere in a building with a surgical zone. Approximately 1000 cubic metres of connected air, 400ml tank, freestanding or wall and HVAC mount, DC 12V / 1A at 5W so it needs a live socket, CE, RoHS and SGS, and a Bluetooth app and timer that let you scent OPD hours only. Two systems, and they are not interchangeable: the ₹299 water-based bottle never goes into a Vaayu, or into Aangan at ₹25,999 for approximately 8,000 to 10,000 sq ft or Meenar at ₹38,500 for approximately 12,000 to 18,000 sq ft, which run waterless nebulising oil and are ducted decisions taken with your own HVAC consultant - never into air handling that serves a clinical zone.
If you are building or refitting rather than buying for a room that already exists, the decisions that matter most are the ones taken on the drawing, and those are in should my hospital architect plan fragrance zones and machine placement at the design stage. If this reception is one of several you operate, the sameness question is in should every day-care hospital in our group have the same signature scent, and the written procedure that keeps it the same is in how to standardise ambient fragrance across a private day-surgery chain.
What SOSA does not publish and this page will therefore 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. Talk them through with your plan in hand on WhatsApp at +91 96192 18531. Bulk orders are welcome, custom label or logo on product is available, and bespoke composition made only for your group 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.