A+2000 Washable Electrostatic Permanent Custom Air Filter - 24 1/2" x 36 1/2" x 1" Quantity:Default from the air stream

from the air stream

some just refer to them as electrostatic filters

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

these can be purchased in any conceivable size

A+2000 Washable Electrostatic Permanent Custom Air Filter - 24 1/2" x 36 1/2" x 1" Quantity:Default from the air streamYou may know them as washable air or even permanent air filters; some just refer to them as electrostatic filters. Either way, the "A+2000" brand Permanent Washable Electrostatic custom air filters are truly quality products, built to last a lifetime. Unlike some permanent custom air filters, the A+2000 uses no foam that may clog, degrade and restrict air flow, so it can provide a lifetime of dependable service. And there are no metal parts that could