Pad Refills (Pack of 6 Pads) - 20 1/8" x 24 3/8" x 1" Quantity:Default One way to overcome this

One way to overcome this problem is to increase the surface area of the filter media

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Eliminates Filter Bypass

if not you can measure it or check the HVAC unit and the owner‰۪s manual

Pad Refills (Pack of 6 Pads) - 20 1/8" x 24 3/8" x 1" Quantity:Default One way to overcome thisPACK of 6 pads for Pad and Frame Air Filters Filtering inserts are anti microbial and are more efficient in capturing particles, such as dust, ragweed, pollen, etc., from the air stream, than standard fiberglass filters purchased at retail outlets. Filtering inserts are shipped in an easily stored packet.