Allertech Vent Guard, 16" x 60" ( 20 Vent Filters per Roll) Poly Nonwoven Made in US EFFICIENT AIR FILTRATION: The electrostatic filter media traps dust and pollen better than other solutions like cheesecloths and gauze, to help significantly lower the number of allergens in the air. ECONOMICAL AND LONG-LASTING: Each pack includes a 16 x 60 roll of filter media with enough material for 20 vent covers and a 30 strip of Velcro for easy installation. VERSATILE DESIGN: The filter media is not precut to any specific shape so you can trim pieces to fit over non-standard vent sizes or use the filters for a variety of other applications. EASY TO USE: The adhesive-backed Velcro strips are easy to remove from the surface of the polyester, making regular filter changes quick and painless. MADE IN THE USA: Our allergy filter kits are proudly made in the USA, so you can be sure that they meet high quality standards.