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Guides
Short explainers for the specs and tests behind the rankings. Each takes a few minutes.
Air Purifier Buyer's Guide
How to pick an air purifier by room size, running cost and noise, and which marketing features to skip.
2 min read
AHAM Verifide Explained
What the AHAM Verifide mark certifies, how the test works, and why uncertified CADR claims are routinely optimistic.
1 min read
CADR Explained
What Clean Air Delivery Rate measures, why smoke CADR is the number to compare, and how to size a purifier to a room.
1 min read
Filter Cost Explained
Why replacement filters often cost more than the purifier, and how we fold running cost into the rankings.
1 min read
HEPA vs HEPA-Type Explained
What True HEPA, H13 and "HEPA-type" actually mean, and why the filter grade matters less than the seal around it.
1 min read
Noise Ratings Explained
How to read decibel ratings on air purifiers, what counts as quiet, and why the usable speed matters more than the top one.
1 min read