Pad Refills (Pack of 6 Pads) - 20" x 20 1/2" x 3/4" Quantity:Default and the greater the pressure

and the greater the pressure drop it creates

The "Practical Pleat" media is up to 28 times more effective at capturing particles than standard fiberglass panel filters

we even have the odd sizes

Includes one Frame and PACK of 6 pads

To order washable electrostatic custom air filters you just need to know the size of the current air filter

Pad Refills (Pack of 6 Pads) - 20" x 20 1/2" x 3/4" Quantity:Default and the greater the pressurePACK 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.