Filtrete 20 In. x 30 In. x 1 In. 100 MPR Basic Custom Fit Trimmable Air Filter Pack options:Pack of 1 x 3-1/8 In

x 3-1/8 In

and felt to wood substructures

-20 throwaway cylinder thread with shutoff x 9/16 In

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Filtrete 20 In. x 30 In. x 1 In. 100 MPR Basic Custom Fit Trimmable Air Filter Pack options:Pack of 1 x 3-1/8 InFiltrete Basic Air Filters capture large airborne particles. These non electrostatic home air filters capture lint and household dust. Quickly cuts to the size needed. Filter is washable and reusable. For best performance, change air filter every 90 days or sooner. A dirty filter will slow down air flow and make the system work harder to keep you warm or cool wasting energy. Sign up for a filter change reminder program that works for you. For