LifeSupplyUSA 5.38 in. x 17.36 in. x 3 in. Replacement True HEPA Filter Fits TPP440 TPP540 TPP640 Air Purifiers ER691

Harmful pollutants and irritants in your home's air can disrupt your quality of life. Keep your home fresh with replacement HEPA filters and rid your air of dust， smoke， pet dander， pollen， mold and more. Does just the thought of springtime make you sneeze. Arm yourself with HEPA and battle pollen， ragweed and grass allergies to help prevent seasonal allergies. A HEPA filter can reduce the amount of pet hair and dander in your air， so you can breathe easy around your pets. Unpleasant odors from cooking， smoke， pets or other projects can linger in your home. HEPA filters can help keep your home smelling its freshest. HEPA filters can remove particles 0.3 microns in size， improving your home's air quality and reducing the spread of sniffles and sneezes.

Replacement true HEPA filter comparable to Therapure TPP440F

Designed to fit Therapure Envion air cleaner models TPP440， TPP540 and TPP640

Includes foam gasket seal to help direct air through filter and keep it from escaping， assisting HEPA filtration process in efficiently capturing/trapping airborne particles

For optimal efficiency， it is recommended replacing every 6 months (dependent on air quality and use)