Pad Refills (Pack of 6 Pads) - 18 1/2" x 18 1/2" x 1" Quantity:Default some just refer to them

some just refer to them as electrostatic filters

the "A+2000" brand Permanent Washable Electrostatic custom air filters are truly quality products

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

28X Increased Efficiency

so it can provide a lifetime of dependable service

Pad Refills (Pack of 6 Pads) - 18 1/2" x 18 1/2" 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.