Pad Refills (Pack of 6 Pads) - 18" x 20" x 1" Quantity:Default some just refer to them

some just refer to them as electrostatic filters

The "Practical Pleat" contains over 500% greater surface area than a MERV 10 one-inch pleat

The secret behind the A+2000‰۪s custom air filters performance is the patented stage loading/peak and valley design

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

with each stage capturing progressively smaller particles inside the filter

Pad Refills (Pack of 6 Pads) - 18" x 20" x 1" Quantity:Default some just refer to themPACK 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.