Pad Refills (Pack of 6 Pads) - 18 1/2" x 29 1/4" x 1" Quantity:Default Either way

Either way

The Pad and Frame Air Filter involves a permanent frame and replaceable filtration pad inserts

And there are no metal parts that could lead to corrosion or oxidation within the filter

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

They are easy to install with custom air filters made to the sizes that you specify

Pad Refills (Pack of 6 Pads) - 18 1/2" x 29 1/4" x 1" Quantity:Default Either wayPACK 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.