Filter-Monster Γ Replacement Filters, 2 Pack Γ Compatible with Therapure TPP440F Filter for Therapure Air Purifier TPP440, TPP540, and TPP640 Air Purifiers

Compatibility: Compatible with Therapure TPP440F filters. Engineered to fit Therapure Envion air purifier models TPP440, TPP540, and TPP640. | Air Quality Improvement: Filtration is rated H13 and removes up to 99.97% of airborne particles as small as 0.3 microns in size including dust, smoke, pollen, pet hair and dander, mold spores and dust mites. | Airtight Seal: Foam gasket seal for high performance filtration directs air through the filter and keeps air from escaping around the sides. | Maintenance: Recommended to change this filter once every six (6) months under normal conditions, and more often under harsh air conditions. Package contains two (2) replacement filters. | Approximate Measurements: Each filter measures 17.8 x 5.25 x 2.4 inches.