Air Purifiers buying guides

Choosing an Air Purifier

Size by CADR, not the box headline. What AHAM Verifide means, why 3,000 sq ft is a 1-ACH number, and which smart features matter.

Best Air Purifier for Allergies

Air changes per hour beat filter grade above H13. How to size a bedroom, run it 24/7, and pick a pre-filter.

CADR Explained

What CADR measures, how AHAM turns it into a room size, and why the box number is roughly five times the real one.

Quiet Air Purifiers for Bedrooms

What 18, 24 and 32 dB sound like at night, why only the low-speed figure counts, and where to put the machine.

HEPA vs Ionizer vs UV-C

Filter grades, carbon, ionizers and UV-C compared on how they actually work - and which of them you should switch off.

Air Purifier Filter and Running Costs

Filters, watts and washables decide the real price. The three-year math on a 10 W bedroom unit against a 130 W tower.

Air Purifiers for Wildfire Smoke

Event sizing is not everyday sizing. CADR headroom, sealing the room, carbon for the smell, and what a purifier cannot fix.