A+2000 Washable Electrostatic Permanent Custom Air Filter - 18 3/4" x 21 3/4" x 1" Quantity:Default You may know them as

You may know them as washable air or even permanent air filters

Instead of face loading (particles captured on the outer surface of the filter)

the A+2000 uses stage loading

Produces no ozone or aldehydes

A+2000 Washable Electrostatic Permanent Custom Air Filter - 18 3/4" x 21 3/4" x 1" Quantity:Default You may know them asYou 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