Can I Create Separate Scented and Fragrance-Free Zones Within a Large Pain Centre?

By counting volumes of air rather than drawing zones on a plan, because fragrance does not respect a line on a drawing and does respect a closed door and a duct. A volume is a space bounded by doors that are normally kept shut and served by its own supply and return. Inside a volume, air mixes; a source anywhere in it reaches everywhere in it, more or less, and a second source adds level rather than reach. Between volumes, air moves only through door openings and shared plant. So the method is: draw the doors that stay shut, ask whoever maintains the plant which spaces each unit serves, and count what is left. A typical large centre has three or four volumes. Reception, the waiting area and the corridor to the cabins are one volume, and it is patient-facing, so it gets one source: for roughly 1,500-3,000 sq ft of connected air, one SOSA Vaayu at ₹11,999, wall or HVAC mounted high on the wall furthest from the door to the clinical wing, on a timer and key-locked at a low step. The cabins off that corridor are the doctors' call - nothing placed inside, a trace through an open door or nothing through a closed one. The procedure wing - procedure rooms, injection suite, fluoroscopy, gowning, day-care, recovery - is a second volume, and it is clinical, so it gets nothing: not a machine at a low setting, not a reed in its corridor, nothing. It is a fragrance-free zone by the absence of a source and the presence of a door, which is the only way a fragrance-free zone can be made; the procedure room page and the pre- and post-procedure page are the reasons. A rehab or physio floor behind its own door is a third volume with its own decision - airflow, laundry and cleaning first, and a trace of the reception register only once the room smells of nothing on its own. A second waiting room for a different speciality, behind a door, is a fourth, and if it is 300-750 sq ft of one open room a Sukoon at ₹1,899 on a shelf is its source. Now the three ways zoning goes wrong. A second machine in the same volume. An owner walks to the far corner of a large reception, finds it faint, and adds a source there; the volume now has two sources adding to the same air, the level rises everywhere, and the far corner is no more even than before. Unevenness within a volume is a placement problem - the source too low, in a supply throw, or near the return - and scenting a large waiting area evenly is the fix; the number of machines is not. A machine per zone on the plan rather than per volume of air. If reception and the corridor to the procedure wing are drawn as two zones but share one air-handling unit and an open archway, they are one volume, and a source in either is a source in both; the second 'zone' is scented whether it was meant to be or not. How the HVAC layout affects where scent is introduced is the page for the plant question, and the answer comes from whoever maintains it, never from us. Two Vaayus for one big volume. Above about 3,000 sq ft of a single connected volume, the honest step is one SOSA Angaan at ₹25,999, rated to 3,000m³, HVAC-connected or standalone - not two Vaayus in the same air, which is the first mistake again at a larger scale. Between 750 and 1,500 sq ft a Vaayu is bought for control, no water, distribution and its mount, never for coverage. So the count for a large centre is usually one source, sometimes two, occasionally an Angaan, and always fewer than the number of rooms; the volumes that get nothing are the point of the exercise, and the fragrance-free list names every one. Whatever the count, the level in each patient-facing volume is set for the slowest walker in it and locked, and fragrance is an ambience decision like lighting or seating. It does not reduce pain, anxiety or stress, it does not affect outcomes, procedure rooms stay unscented, and the clinician's judgement overrides any plan - including which volumes this one draws.