Toyo Aluminum AllerBlock Vent 21cm X Pack of for Indoor and Outdoor Simply Stick Pollen and Insect Easy Filtan Ventilation S5447 Filter, Approx. 21cm,

Size (approx.): 21 x 21 cm, Material: Anti-allergenic nonwoven fabric, Country of origin: Japan [Product Concept] The anti-allergen nonwoven fabric filter (dust filter) is easy to install and remove with a peel-and-stick adhesive, and catches dust that accumulates in the room's air vents, preventing dirt and clogging inside the fan. Maintaining the performance of the air vents and circulating clean air creates a comfortable home. [Easy to install] The adhesive filter makes installation as easy as sticking it on like a sticker. [Visually Indicating Replacement Time] When the filter becomes dirty, a replacement notification sign appears, making it easy to see when it's time to replace it. [Philtan Brand] With the motto "I'm glad I put it on! A beautiful life," the brand protects your home from troublesome stains and makes cleaning much easier. As a preventative cleaning item, it offers filters to prevent oil stains on kitchen exhaust fans, toilet, dressing room and bathroom exhaust fans, room vents, and dust prevention filters for home appliances.