The Box Fan Filter for 20 in. box fans is custom-sized to fit almost all 20 square box fans. It is made of a special blend of polyester synthetic media that is designed to be washable and air dried making it good for multiple uses. The filter protects you from large particles sticking to your fan and the further spread of airborne contaminants.
Helps reduce allergens and pet dander
Keeps fan blades clean
Can be trimmed for custom fit
Washable
Easy to install
Reusable
Easily clips to back of box fan
Easy to store
Prevents dust from blowing through the room
Warranted against manufacturer defects
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