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Filters up to 99.9% of pollutants
3 layers of filtration
Ensure your PuroAir 400 Air Purifier continues to deliver fresh, clean air with the PuroAir 400 Replacement Filter. This advanced HEPA filter tackles particles such as dust, allergens*, and odors, maintaining peak performance. Replace every 90 days for optimal results.
Keep your PuroAir 400 Air Purifier performing at its highest level with the PuroAir 400 Replacement Filter. Specially crafted for the PuroAir 400, this replacement filter is key to maintaining superior air purification. It effectively filters small particles, including dust, pollen, pet dander, smoke, and odors, ensuring the air in your home remains clean and fresh.
The filter’s three-layer system provides comprehensive air purification. The pre-filter filters larger debris like dust and pet hair, helping to extend the life of the other filters. The HEPA layer filters particles as small as 0.1 microns, improving indoor air quality. Finally, the activated carbon layer helps to filter out odors, smoke, and VOCs.
According to EPA recommendations, replacing the filter every 90 days ensures optimal air quality and performance. However, more frequent replacements may be necessary in areas with higher pollution, such as during wildfire season. Regular filter changes also support a healthier living environment, promoting better cognitive function and reducing respiratory discomfort.
Enjoy free same-day shipping**, a 100-day cleaner air guarantee, and a lifetime warranty on your air purifier when you subscribe to our filter replacement program.
*Tested to remove Fel d 1 and pollen in an ISO 17025 certified lab.
We're absolutely confident that you'll adore your PuroAir! With our science-backed air purifiers and HEPA filters, we assure you that your home or office's air quality will be noticeably cleaner. And if by any chance you're not completely satisfied, we'll refund your money hassle-free. No questions asked! So, breathe easy knowing you're in good hands with PuroAir.
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Filters larger particles like dust, hair, pollen, carpet fibers, and other visible debris.
Filters up to 99.9% of air pollutants including allergens*, pet dander and dust.
Proprietary blend of activated carbon designed to filter odors, smoke, gases, and VOCs.
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Furry pets, dust mites
Vehicle exhaust from attached garages, gas stoves, furnaces, woodstoves, fireplaces & cigarettes
Cigarette smoke, recently dry-cleaned cloths, room deodorizers, paints, carpets
Tobacco smoke, vaping, incense, wildfires
Presence of cats and dogs, contaminated humidifiers, storage of food waste, lower ventilation rate, increased amount of settled dust
Unattended plumbing leaks, leaks in building fabric, hidden food spills,
Wood-based products assembled using urea-formaldehyde resins, cigarette smoke, paints, varnishes, floor finishes
Polyvinyl chloride for flooring, plastic wall material
Cooking and heating
Combustion of fossil fuels e.g., gas or oil furnaces and stoves
Contaminated soil, stored pesticide containers
Natural decay of uranium
Cooking, combustion activities
We recommend replacing your air purifier filter every 3 months or 90 days. Due to build-up of captured air pollutants, waiting longer than 90 days could decrease the effectiveness of your air purifier. During periods of poor air quality due to increased allergens, wildfire smoke, renovation projects, etc. we recommend replacing the filter sooner.
Free Same Day Shipping
100-Day Cleaner Air Guarantee
Lifetime Warranty with Subscription
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