The CADR an air purifier needs to clean your room, for smog, dust, allergies or smoke.
How this works
CADR (m³/h) = room volume x air changes per hour. Use 3 changes for general use, 5 for allergies and 6 for heavy smog or smoke. The AHAM 2/3 rule also says CADR in CFM should be at least 2/3 of the floor area in sq ft. 1 CFM = 1.7 m³/h.
Questions people ask
How do I use the Air Purifier Size tool?
Fill in the fields, starting with “Room length”, “Room width” and “Ceiling height”, and change any other options that match your home. The answer, a drawing and practical tips update as you type, and the Copy link button saves your numbers in a link you can share.
Is the Air Purifier Size tool free?
Yes. The Air Purifier Size tool is free, with no sign-up, and works on phones, tablets and computers. The results are estimates to help you plan, so check with a qualified professional before structural, electrical, gas or plumbing work.