The heavy duty aluminum frame with water drain holes makes for easy cleaning.
These filters should be washed every 3 months, and more frequently if you have many pets. Electrostatic Filter for Home Furnaces - Washable - 12 x 20 x 1 This filter's dimensions measure 12 x 20 x 1. The electrostatic materials we use capture dust, dirt, pollen, pet dander, allergens, pet hair, and other household irritants.This electrostatic furnace filter is a permanent filter which will last for years with proper care.