★ SOSA for Diagnostic, Pathology and Imaging Centres
The scented zone starts at your door; the source that makes it never should
★ ★ ★ ★ ★
★★★★★
"Our old water diffuser couldn't fill the living-dining. This one does the whole floor and you can't hear it running."
SOSA Vaayu · large home
★★★★★
"The app scheduling is the best part - strong in the mornings, gentle in the evening. Clinic feels calm all day."
SOSA Vaayu · wellness studio
★★★★★
"Paired it with the SOSA hotel oils. The projection is genuinely lobby-strength - nothing like a plug-in."
SOSA Vaayu · workspace
★★★★★
"My reception now smells like a five-star lobby. Guests comment on it before they even reach the desk."
SOSA Vaayu · lobby scenting
★★★★★
"Zero dampness, which was my worry in monsoon. The mist is completely dry and the scent carries across the whole salon."
SOSA Vaayu · spa & salon
★★★★★
"Set the timer once and forgot about it. Runs only during store hours, refills last weeks. Exactly what I wanted."
SOSA Vaayu · showroom
★★★★★
"Our old water diffuser couldn't fill the living-dining. This one does the whole floor and you can't hear it running."
SOSA Vaayu · large home
★★★★★
"The app scheduling is the best part - strong in the mornings, gentle in the evening. Clinic feels calm all day."
SOSA Vaayu · wellness studio
★★★★★
"Paired it with the SOSA hotel oils. The projection is genuinely lobby-strength - nothing like a plug-in."
SOSA Vaayu · workspace
★★★★★
"My reception now smells like a five-star lobby. Guests comment on it before they even reach the desk."
SOSA Vaayu · lobby scenting
★★★★★
"Zero dampness, which was my worry in monsoon. The mist is completely dry and the scent carries across the whole salon."
SOSA Vaayu · spa & salon
★★★★★
"Set the timer once and forgot about it. Runs only during store hours, refills last weeks. Exactly what I wanted."
SOSA Vaayu · showroom
★ Formats that can sit deep and still reach the door
SOSA VaayuWall-mounted, well back from the thresholdView ₹11,999
SOSA VaayuRun windows for the busiest door hoursView ₹11,999
SOSA AngaanDucted, for an entrance hall rather than a doorView ₹25,999
✓ 1.5 to 2 metres past the threshold, off the traffic line, out of the draught ✓ An automatic sliding door is a pressure boundary, not a display shelf ✓ Made in India · independent, not affiliated with any hotel · a portion funds girl-child education
Founder Diaries · Commercial Scenting Guides · Diagnostic Centres
How far inside the door should the source actually go? Roughly 1.5 to 2 metres past the threshold as a starting point, offset to one side of the walking line, and clear of any air curtain, supply grille or standing fan. Around a metre above the floor works better than at ankle height or above head height. In a deep reception you can go further in still. The rule is to be inside the room's air rather than inside the exchange happening at the door.
What if my entrance is a permanently open shutter? Then there is no fragrance answer to it, and I would rather say that than sell you something. A shutter that stands open onto a street is not a boundary at all; the reception is effectively outdoor air with a roof. Scent whatever room sits behind an actual door, accept that the shutter frontage will read as the street, and spend the money on the inner space instead.
See the SOSA Vaayu Book a scenting plan
Facts verified 5 September 2026 against the live SOSA product pages: the SOSA Vaayu (₹11,999) is a waterless cold-air nebuliser rated to 1000m³, described by the manufacturer as approximately 2,000-3,000 sq ft, with a 400ml refillable tank lasting 90+ days depending on intensity and run hours, Bluetooth app and onboard button control, 1h/4h/8h/24h timers, adjustable intensity, operation under 38dB, DC 12V/1A at 5W (roughly 1.5 units of electricity a month on a ten-hour daily schedule), freestanding or wall and HVAC mounting, auto-stop and key-lock, and CE, RoHS and SGS certification. Being waterless, it adds no moisture and leaves no residue on surfaces or equipment. The SOSA Angaan (₹25,999) is an HVAC nebulising diffuser rated to 3,000m³, roughly 8,000-10,000 sq ft, with an 800ml reservoir, metal body, programmable schedules and operation under 42dB, and also runs standalone wall-mounted or lay-flat. The SOSA Meenar (₹38,500) is the largest machine in the range, quoted for roughly 12,000-18,000 sq ft of HVAC-connected space. Ambient scent is an interior and hospitality decision: it works alongside proper ventilation, cleaning and clinical protocol and is not a substitute for any of them, it is not a medical device, and SOSA makes no health, therapeutic or treatment claim of any kind and no claim that fragrance affects bookings, retention or spend. CE, RoHS and SGS are electrical and compliance marks, not medical approval. The hotel-inspired scents are SOSA's own original interpretations; SOSA is an independent brand and is not affiliated with, or endorsed by, any hotel named for reference. Coverage, fragrance usage and running cost depend on the space, settings and hours of use, and are confirmed on a consultation. Prices and availability are subject to change - see the live product pages.
Both halves of this question have an answer and they are different answers, which is why it causes so much confusion. The zone the patient experiences starts at the door; the equipment that produces it belongs well inside the room.
Quick answers — read this first
Should fragrance begin at the entrance or inside reception? The experience should begin at the entrance and the source should sit inside reception. Those are not in conflict - a source placed a couple of metres in will be perceptible at the threshold, because air moves inward with each person who enters. What does not work is putting the bottle or machine in the doorway itself. That is a pressure and traffic boundary, and output released there leaves with the next cycle rather than filling the room behind it.How far inside the door should the source actually go? Roughly 1.5 to 2 metres past the threshold as a starting point, offset to one side of the walking line, and clear of any air curtain, supply grille or standing fan. Around a metre above the floor works better than at ankle height or above head height. In a deep reception you can go further in still. The rule is to be inside the room's air rather than inside the exchange happening at the door.
What if my entrance is a permanently open shutter? Then there is no fragrance answer to it, and I would rather say that than sell you something. A shutter that stands open onto a street is not a boundary at all; the reception is effectively outdoor air with a roof. Scent whatever room sits behind an actual door, accept that the shutter frontage will read as the street, and spend the money on the inner space instead.
The short answer
Short answer: The experience begins at the entrance; the source belongs inside reception. Set it 1.5 to 2 metres past the threshold, off the walking line and out of any draught or air-curtain path, roughly a metre up. A doorway is a pressure and traffic boundary, so a diffuser placed there spends its output on the pavement instead of the room.
The pick: one Morning Freshness reed at ₹749 set behind the desk line, or a wall-mounted SOSA Vaayu at ₹11,999 in a large entrance hall.
Next step: tell us what kind of front door you have - swing, automatic sliding, vestibule or open shutter - and we will tell you where the source goes, ask for a clinic scenting plan.
In this guide
Every line here is a placement decision, and every one of them is free. Moving what you already own comes before buying anything new.
Formats that sit well back and still reach the threshold - tap for the specification
Mounted deep, reaching the door
SOSA Vaayu · ₹11,999
What the patient meets on the way in
What patients should smell on entering
Placement before purchase
Free clinic scenting plan
Straight answer
Should the fragrance start at the entrance, or only once someone is inside reception?
The scented zone starts at your entrance. The source that creates it belongs inside reception, and those two statements are not in tension - they are the whole answer. A diffuser set a couple of metres inside is perfectly perceptible at the threshold, because every person who walks in drags a slug of outside air past themselves and displaces room air toward the door. You do not need equipment at the door to have fragrance at the door. What you must avoid is putting the source in the boundary. A doorway is where pressure, temperature and traffic all change at once, and in a diagnostic centre it changes constantly, because the fasting-sample peak has that door cycling for three hours straight. Anything releasing into that zone is releasing into air that is on its way out. This is the single most common placement error I see, and it is made for a good reason: the console table by the entrance is the most attractive spot in the room, so that is where the bottle goes. It is also the worst-performing spot in the building. The specification I would give you is simple. Put the source roughly 1.5 to 2 metres past the threshold, offset to one side of the walking line rather than in it, out of the direct path of any air curtain, supply grille, standing fan or open window, and about a metre above the floor - low enough not to be at a seated patient's head height, high enough not to be kicked. In a deep reception, further in is better still; behind or beside the desk usually works. Three qualifications. If you have a vestibule or double set of doors, you are fortunate: that is a genuine buffer and the inner door is your real threshold. If you have an automatic sliding door that opens for anyone who walks past on the pavement, the exchange is worse than you think and depth matters more. And if your frontage is a shutter that stands open all day, there is no fragrance answer to it - scent the room behind an actual door and leave the shutter alone. Everything behind the corridor stays unscented regardless: no source goes into collection, processing, bench or scan rooms, and that call belongs to your lab and radiographer. Fragrance here is an ambience decision like lighting, seating or signage, it sits alongside ventilation and cleaning rather than instead of them, SOSA products are not medical devices, and the clinician's judgement overrides any scenting plan.
The zone begins at the door; the source belongs 1.5 to 2 metres inside it, off the walking line and out of the draught. A diffuser in the doorway spends its output on the pavement.
Placement first: move what you own before buying. If you then need reach, a wall-mounted SOSA Vaayu at ₹11,999 can sit well back and still serve the threshold; a Morning Freshness reed at ₹749 behind the desk does it in a small reception.
See the SOSA Vaayu ₹11,999 Ask for a clinic scenting plan
Why depth and reach beat proximity
A source set back that still serves the door
Formats that can sit deep and still reach the threshold
A bottle can only work where it stands, which is fine in a small reception and limiting in a large one. These two can be positioned well away from the entrance and still put fragrance into the arrival zone, which is the practical reason a large centre buys one.
For a reception deep enough to place properly
SOSA Vaayu
Waterless cold-air nebuliser at ₹11,999, rated to 1000m³. Wall-mountable, so it can sit two or three metres back from the entrance, above the traffic line and out of the door draught, and still serve the threshold that a desk bottle could not reach from the same position.
From ₹11,999
For an entrance hall rather than an entrance
SOSA Angaan
HVAC nebulising diffuser at ₹25,999, rated to 3,000m³ with an 800ml reservoir. Where the arrival space is large and ducted, introducing at the air handling rather than at a point in the room removes the placement question almost entirely.
From ₹25,999
Why the doorway loses, and what to do instead
Three reasons the most attractive position in the room is also the worst one, and the correction for each.
1
One
A door is a boundary, and boundaries move air outward
Each time your entrance opens, a volume of reception air leaves and an equivalent volume of street or lobby air arrives. In a diagnostic centre during the morning peak that happens continuously for hours. A source sitting in that zone is releasing into air that is already leaving, so a measurable share of everything it produces ends up outside. Two metres further in, the same source is releasing into air that stays in the room long enough to distribute. The difference is not subtle and it costs nothing to test: move whatever you already own inward, leave it a fortnight, and judge with a cold nose at 9am. In my experience that single move resolves about half the complaints I get about a diffuser that seems to have stopped working.
Tip: Mark the spot with tape before you move anything, so you can put it back if the change genuinely makes things worse.
A wall-mounted Vaayu can be positioned by air path rather than by furniture, which is the practical advantage over a bottle that has to live on a surface.
See SOSA Vaayu →
2
Two
Air curtains, grilles and fans scatter whatever is near them
Many diagnostic entrances have an air curtain over the door, a supply grille close by, or a pedestal fan aimed at the queue. Each of those is a jet, and a jet does not distribute fragrance evenly - it throws it in one direction very quickly and dilutes it on the way. Put a source in front of one and you get a strong plume across a narrow band, nothing in the rest of the room, and a bottle that empties far faster than it should. The correction is to place away from the jet and to work with the room's return path instead, which is usually toward a corridor mouth or a return grille on the opposite side. If you do not know where your return is, that is worth finding out before you spend anything, and your facilities engineer will know in a minute.
Tip: Hold a light tissue at head height in three places in reception. Where it moves is where your air is going, and that is where the source should not be.
Where ducting is accessible, a Vaayu can be introduced into the air handling instead, which makes the room's own distribution do the work.
See SOSA Vaayu →
3
Three
The shape of your frontage sets the ceiling on what is possible
Three frontages behave completely differently. A single swing door into a deep reception is the easy case, and almost any format placed properly will work. A vestibule or double door set is better still, because the two doors are rarely open at the same moment and the lobby between them is a genuine buffer. An automatic sliding door is worse than it looks, particularly where it triggers for people passing on the pavement, because it cycles far more often than your patient count suggests. And a roller shutter standing open all day is not a boundary at all - the reception behind it is effectively outdoor air, and there is no honest scenting plan for that space. If that is your frontage, scent the inner waiting room behind a real door and leave the front strip alone.
Tip: Watch your automatic door for five minutes. If it opens for pedestrians who never come in, your exchange rate is higher than your footfall suggests.
For a large ducted entrance hall, an Angaan at ₹25,999 introduces at the air handling, which sidesteps the doorway question rather than fighting it.
See SOSA Angaan →
The SOSA principle
The best-looking place for a diffuser in a diagnostic centre is the console table by the door, and it is the one place in the building where the output does not stay.
Placement is decided by where the air goes, and the air at your entrance is going outside several hundred times a morning.
Three entrance types, three different answers
Find your frontage in this table before you decide anything. The right position, and in one case whether there is a right position at all, depends on which of these you have.
The SOSA plan
Three frontages and where the source goes in each
| Your entrance | Where the source belongs |
|---|---|
|
Single swing door into a deep reception
|
The easy case. Source 1.5 to 2 metres in, offset from the walking line, roughly a metre up. Almost any format works if it is placed properly. View → |
|
Vestibule or double doors
|
The best case, and you already own the solution. Treat the inner door as your real threshold and place inside that. The lobby between the doors gets nothing and needs nothing. |
|
Automatic sliding door
|
Cycles far more often than your patient count implies, sometimes for passers-by. Go deeper - three metres or more - and consider a driven source that can be raised for the peak. View → |
|
Open roller shutter onto the street
|
There is no fragrance answer here, and I would rather tell you than sell you one. Scent the inner room behind a real door if you have one, and treat the front strip as outdoor air. |
What the patient should actually meet on the way in is covered in what patients should smell when they first enter, placement in a big room is worked through in where a scent machine should be placed in a large reception, and the door-traffic effect on format is in reed diffuser against professional scent machine. SOSA makes no health or therapeutic claim of any kind, and no claim that scenting affects how a centre performs commercially.
Swing, sliding, vestibule or shutter
Tell us which one you have and we will tell you where the source goes. In two of the four cases the answer costs nothing.
Nobody puts the diffuser in the doorway to be seen. They put it there because the doorway is where the room feels like it starts, and the air disagrees.
— Sonal Sahani, SOSA
When placement alone is not enough
Reach from a set-back position, one source per volume
The SOSA entrance specification
Placed by air path rather than by furniture, set back from the threshold, and sized to the public volume only. Made in India, and a portion of every order supports girl-child education through Nanhi Kali.
The SOSA entrance specification
The zone starts at the door, the equipment sits inside it
| Machine | Best for | Why it works | Price |
|---|---|---|---|
|
SOSA Vaayu
|
A large reception where the source must sit well back | ₹11,999, wall or HVAC mountable, adjustable, key-locked, 400ml for 90+ days | ₹11,999 View → |
|
SOSA Angaan
|
A ducted entrance hall where placement is the whole problem | ₹25,999, introduced at the air handling, 800ml, programmable schedules | ₹25,999 View → |
In a small reception the answer is a reed at ₹749-₹849 placed behind the desk rather than by the door, and moving what you already own costs nothing at all. Fragrance here is an ambience decision like lighting or signage, with no health, therapeutic or clinical claim of any kind, and no claim that it affects how a business performs. It works alongside your ventilation, cleaning and laboratory protocol, never instead of them, and SOSA products are not medical devices. Collection, processing and scan rooms stay unscented, staff must be able to switch the source off in seconds, and the clinician's judgement overrides any plan. Ask for a clinic scenting plan and we will place it against your actual frontage.
SS
ISIPCA
Versailles
Versailles
A note from Sonal
I once spent an afternoon at a centre where the owner had bought three bottles in six months and concluded that our reeds do not last. All three had lived on the same glass console immediately beside an automatic sliding door that opened perhaps four hundred times a morning. The bottles were not defective; they were being ventilated at industrial scale, and the reception behind them never smelled of anything.
We moved the fourth bottle to the end of the reception desk, about two and a half metres in and off the walking line, and left it a fortnight. That was the whole intervention. It cost nothing, it used a bottle he already had, and I did not sell him a machine that day. I mention it because placement is the cheapest lever in this entire cluster and it is almost always tried last.
The honest limit is the frontage itself. If your entrance is a shutter that stands open onto a street, no placement and no product I make will give you a scented reception, and I would rather write that on my own website than have you find out after the invoice. We make no health, therapeutic or clinical claim of any kind, and no claim that scenting affects how a centre performs commercially. Fragrance is an ambience decision, like lighting or seating. Clinical rooms stay unscented, and the clinician's judgement overrides any plan. Made in India, and a portion of every order supports girl-child education through Nanhi Kali.
Frequently asked questions
Is it wrong to put a diffuser right at the entrance door?
Yes, in almost every diagnostic centre. A doorway is a pressure and traffic boundary, and a busy entrance cycles for hours during the morning peak, so a source placed there releases into air that is on its way out. Move it 1.5 to 2 metres inside, off the walking line, and judge again with a cold nose after a fortnight.
Will the fragrance still be noticeable at the door if the source is inside?
Yes. Each person entering displaces room air toward the threshold, so a source placed a couple of metres in is perceptible as somebody walks through. You are creating a zone rather than a point, and the zone reaches the door even though the equipment does not sit there.
Does an air curtain stop ambient fragrance from working?
It changes where you can put the source rather than ruling it out. An air curtain is a jet, and anything released into it is thrown in one direction and diluted quickly. Place away from it and work with the room's return path instead. If you do not know where the return is, ask your facilities engineer before buying anything.
Should reception and the entrance have separate diffusers?
No. If they are one connected space they are one volume of air, and two sources in one volume compete rather than combine - you get gradients rather than coverage. Use a single correctly placed source, and let the entrance be the leading edge of that one zone.
What about a vestibule between two sets of doors?
That is the best entrance to have, and it needs nothing of its own. Treat the inner door as your real threshold, place the source inside that, and let the vestibule work as the buffer it already is. It also means less of your reception air is lost with each cycle.
Zone at the door, source inside it
SOSA — Clinic Scenting where the scented zone actually begins
1.5 to 2 metres past the threshold, off the walking line, out of the draught and roughly a metre up. Move what you own before buying anything; a reed at ₹749 does it in a small reception. Made in India, and a portion of every order supports girl-child education through Nanhi Kali.
Ask for a clinic scenting plan → SOSA Vaayu · ₹11,999
One more look at the set-back formats
Continue the read
More from SOSA
Editorial standards & sources
About this guide: Written by Sonal Sahani, ISIPCA Versailles-trained founder and perfumer at SOSA Home & Body. Product recommendations reflect the SOSA range; the planning advice applies to any brand.Facts verified 5 September 2026 against the live SOSA product pages: the SOSA Vaayu (₹11,999) is a waterless cold-air nebuliser rated to 1000m³, described by the manufacturer as approximately 2,000-3,000 sq ft, with a 400ml refillable tank lasting 90+ days depending on intensity and run hours, Bluetooth app and onboard button control, 1h/4h/8h/24h timers, adjustable intensity, operation under 38dB, DC 12V/1A at 5W (roughly 1.5 units of electricity a month on a ten-hour daily schedule), freestanding or wall and HVAC mounting, auto-stop and key-lock, and CE, RoHS and SGS certification. Being waterless, it adds no moisture and leaves no residue on surfaces or equipment. The SOSA Angaan (₹25,999) is an HVAC nebulising diffuser rated to 3,000m³, roughly 8,000-10,000 sq ft, with an 800ml reservoir, metal body, programmable schedules and operation under 42dB, and also runs standalone wall-mounted or lay-flat. The SOSA Meenar (₹38,500) is the largest machine in the range, quoted for roughly 12,000-18,000 sq ft of HVAC-connected space. Ambient scent is an interior and hospitality decision: it works alongside proper ventilation, cleaning and clinical protocol and is not a substitute for any of them, it is not a medical device, and SOSA makes no health, therapeutic or treatment claim of any kind and no claim that fragrance affects bookings, retention or spend. CE, RoHS and SGS are electrical and compliance marks, not medical approval. The hotel-inspired scents are SOSA's own original interpretations; SOSA is an independent brand and is not affiliated with, or endorsed by, any hotel named for reference. Coverage, fragrance usage and running cost depend on the space, settings and hours of use, and are confirmed on a consultation. Prices and availability are subject to change - see the live product pages.