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Buying guide
How to Choose an Air Purifier for Your Home
Start with room area and clean-air delivery at a stated air-change rate. Then check noise, filter supply and placement needs.
Quick answer
- Measure floor area.
- Compare CADR at a similar ACH.
- Check noise on the speed you will use.
- Confirm replacement-filter availability and interval.
Match the purifier to the room
CADR describes filtered-air delivery. Compare figures using the same particle category and air-change assumptions. A room-size figure without ACH is difficult to compare.
Check noise and controls
A minimum dB figure may describe the lowest fan setting, not sleep mode. Check the manufacturer?s wording.
Plan for filter upkeep
Find the filter part number, replacement interval and local availability. Do not infer annual cost without a dated local price.
Consider placement and safety
Follow the manual?s clearance and electrical instructions. Consult EPA guidance on air cleaners and ozone.
Compare the key criteria
| Criterion | Check | Why |
|---|---|---|
| CADR | Figure and particle category | Room matching |
| Coverage | Area and ACH assumption | Claims differ by airflow rate |
| Noise | Range and sleep setting | Minimum may not equal sleep mode |
| Filters | Part number and interval | Upkeep |
Your checklist
- Measure room area in sq ft.
- Compare CADR at similar ACH.
- Check sleep noise and light controls.
- Find filter part number and interval.
- Read placement instructions.
Sources and how we chose
Canada EPA: https://www.epa.gov/indoor-air-quality-iaq/air-cleaners-and-air-filters-home (consulted 13 Oct 2026)
Canadian Blueair reference: https://www.blueair.com/en-ca/products/blue-pure-511 (French-language manufacturer page; technical figures require English/Canada verification).