The air cleaner's CADR is determined in a test chamber:
CADR =
= (volume of test chamber in cubic feet) * ((measured decay rate of the particulate material being tested) - (natural decay rate of the particulate material))
The air cleaner may be tested for its ability to remove:
(1) tobacco smoke
(2) dust
(3) pollen
If the CADR is known, then the largest room it can clean is:
largest room with floor area square feet =
= (CADR value) * 1.55
floor area for a room in square feet =
= (length of the room in feet) * (width of the room in feet)
If the room size is known, then CADR to select is:
required CADR =
= (floor area in square feet) * 0.645
If a room has a ceiling height greater than 8 feet, then an air cleaner with a higher CADR should be selected. However, I could not find how this is specified. One way I can think of is:
(ceiling height in feet) / 8 * (CADR for regular room) =
= CADR required
