04 Jul 2026 · 3 min read
Coverage is a volume problem, not a floor problem
A 2,000 ft² room with a 20-foot ceiling holds twice the air of the same room at 10 feet. The machine does not care about your floor plan.
Every diffuser on the market, ours included, is sold with a coverage figure in square feet. It is a useful shorthand and it is also the single most misleading number in this industry.
## Air is measured in three dimensions
Scent disperses through a volume of air. A 2,000 ft² restaurant with a standard 10-foot ceiling contains 20,000 cubic feet. The same footprint in a converted warehouse with a 20-foot ceiling contains 40,000. Identical on paper, and one of them needs twice the machine.
This is why we survey. It takes twenty minutes and it is the difference between a unit that holds an accord across the floor and one that scents a three-metre radius around itself while the far wall smells of the kitchen.
## The other two variables
**Air exchange rate.** How many times an hour does the HVAC replace the air in the room? A gym might be at eight; a sealed office at two. Scented air that leaves through a vent is money leaving through a vent, and a high-exchange room needs more oil to hold the same perceived level.
**Door traffic.** Every opening of a street door dumps the accord and replaces it with whatever is outside. A retail entrance in Gulshan during rush hour is a fundamentally different problem from an interior treatment room, even at the same volume.
## Use the number as a floor, not a ceiling
When you read '5,000 ft²' on a spec sheet, read it as: five thousand square feet, ten-foot ceiling, moderate air exchange, low door traffic. Deviate from any of those and the real number drops. Ours are quoted honestly, which is why they look lower than some competitors'.
## Air is measured in three dimensions
Scent disperses through a volume of air. A 2,000 ft² restaurant with a standard 10-foot ceiling contains 20,000 cubic feet. The same footprint in a converted warehouse with a 20-foot ceiling contains 40,000. Identical on paper, and one of them needs twice the machine.
This is why we survey. It takes twenty minutes and it is the difference between a unit that holds an accord across the floor and one that scents a three-metre radius around itself while the far wall smells of the kitchen.
## The other two variables
**Air exchange rate.** How many times an hour does the HVAC replace the air in the room? A gym might be at eight; a sealed office at two. Scented air that leaves through a vent is money leaving through a vent, and a high-exchange room needs more oil to hold the same perceived level.
**Door traffic.** Every opening of a street door dumps the accord and replaces it with whatever is outside. A retail entrance in Gulshan during rush hour is a fundamentally different problem from an interior treatment room, even at the same volume.
## Use the number as a floor, not a ceiling
When you read '5,000 ft²' on a spec sheet, read it as: five thousand square feet, ten-foot ceiling, moderate air exchange, low door traffic. Deviate from any of those and the real number drops. Ours are quoted honestly, which is why they look lower than some competitors'.