What size air purifier for your room: the math, worked out
Air purifier room size in one sum: a smoke CADR of two-thirds of the floor area. Worked examples, air changes per hour, high ceilings, smoke and open plans.
Home
CADR, room size, noise and energy
Reading CADR, matching a unit to a room with worked arithmetic, and what noise and electricity use really depend on.
CADR ratings explained: what the three numbers measure
CADR is the clean air a portable purifier delivers, in cfm, tested on smoke, dust and pollen at top speed. What it measures, what it misses, how to read it.