What size air purifier does this room need?

by The Air Math

Method follows the EPA guidance on matching CADR to room size.

Room size floor area (ft²)

200

Ceiling height ft

Air changes per hour 4.8 = AHAM standard; allergies/smoke want more

4.8

Hours run per day

Electricity price $/kWh

$0.17

🌀 Clean-air delivery rate needed

0 CFM

💵 Cost to run / year

⏱️ Cost per hour

See which unit fits — and what it costs →

Free calculator by The Air Math · desk-researched from AHAM/EPA methodology; the 600S-P figure is ENERGY STAR registry-confirmed, the two smaller ones are manufacturer-stated · put this on your site