HQRP 2-Pack HEPA Filter Compatible with Envion Therapure TPP440F TPP440 TPP540 TPP640 TPP640S Air Purifier

2 weeks DOA replacement warranty!. Compatible with Original filter; Dimensions approximately: 17.9 x 5.3 x 2.95 inches. NOTE: This filter is not washable. Replace every 6 to 12 months for optimal performance. Easy to install. Essential For Allergy Sufferers. HQRP® 2-pack Replacement Air Purifier Filter; HEPA Replacement Compatible with Envion Therapure TPP440 TPP540 TPP640 TPP640S Air Purifier High quality and durable air filter replacements, which evidently improve the air quality