Focus on the Numbers That Matter

When you’re shopping for an air purifier, ignore the marketing fluff. Two numbers tell you everything you need to know: CADR rating and room coverage.

The Essential Specifications

CADR (Clean Air Delivery Rate) measures how much clean air comes out of your purifier, expressed in cubic feet per minute. Higher CADR means faster air cleaning. Look for separate ratings for smoke, dust, and pollen—the smoke rating typically indicates the best overall performance.

Room Size Coverage tells you the maximum space the purifier can handle on its highest setting. Match this to your actual room size, or you’ll be running an underpowered machine that never catches up.

The Filter That Does the Work

A True HEPA filter removes 99.97% of particles as small as 0.3 microns. That includes viruses, allergens, PM2.5, dust, and bacteria. Some brands use H12 or H13 filters—both work excellently.

Skip the expensive add-ons. UV lights and ionizers don’t improve performance and can actually increase harmful pollutants like formaldehyde. You need just two things: a fan and a HEPA filter.
Features Worth Considering

• Multiple fan speeds give you control over noise and performance
• Activated carbon filters tackle odors and VOCs if you need them
• Noise levels under 60 dB on high speed won’t disturb sleep or work

Verify the Claims

Don’t trust manufacturer claims alone. Check AHAM (Association of Home Appliance Manufacturers) test results—they provide independent CADR verification. Third-party reviews from sources like

HouseFresh offer real-world performance data.

The bottom line: Clean air shouldn’t cost thousands. A simple purifier with a good HEPA filter and adequate CADR can match the performance of luxury brands at a fraction of the price.