Toyo Aluminium Dust-Catching Filter for Ventilation Fans, Outdoor, Stick-On, Allergen Block, Air Vent, Approximately 21cm x 21cm, Pack of 3, Fil-tan S5422 This is a set of 2. ▫️Brand: ToyoAluminium ▫️Material: Anti-allergen processed non-woven fabric ▫️Product Dimensions: Length 100 x Width 21 x Thickness 3 cm Compatible Device: Air Vent ▫️Product Weight: 0.02 kilograms A filter that prevents dust, pollen, exhaust gas, and insects from entering your room by sticking it on outdoor air vents. Just stick it on. Peelable sticker processing. Comes with tabs for secure adhesion. Anti-allergen processed non-woven fabric Made in Japan