True HEPA Air Purifiers
A true HEPA filter meets the US Department of Energy standard of capturing at least 99.97% of particles 0.3 microns in size, the hardest size to trap. "HEPA-type" or "HEPA-like" filters have no such guarantee, so check the wording before you buy.
Choosing a true HEPA purifier
- Wording: look for "true HEPA" or "HEPA H13". Some European-made units quote H13, which is rated at 99.95% at its most penetrating particle size.
- CADR matters as much as the filter: a great filter with weak airflow cleans a room slowly.
- Seal: a HEPA filter only works if air cannot leak around it.
- Carbon stage: add one if you need odor control.
- Filter cost: compare price and change interval, typically 6 to 12 months.
Shop by budget with Air Purifiers Under $100 and Air Purifiers Under $200, or step up to Smart Air Purifiers with app control and air quality sensors.
FAQs
What is the difference between true HEPA and HEPA-type?
True HEPA filters meet a defined standard: at least 99.97% capture of 0.3-micron particles. HEPA-type, HEPA-like or HEPA-style filters are marketing terms with no required performance, and some capture far less. If a listing does not say true HEPA or give a filtration grade such as H13, assume it is not.
Do HEPA filters remove viruses?
HEPA filters capture particles across a wide size range, including the respiratory droplets and aerosols that can carry viruses. EPA notes that portable air cleaners can help reduce airborne contaminants including viruses in a space, but they are not enough on their own and should be combined with ventilation and other measures.
Can you wash a true HEPA filter?
Generally no. Washing damages the fine glass fiber media and can encourage mold if it stays damp. Only filters the manufacturer labels washable or permanent should be rinsed, and those are often not true HEPA. Pre-filters are usually washable or vacuumable, which helps extend the main filter's life.
