A+2000 Washable Electrostatic Permanent Custom Air Filter - 11 3/8" x 11 3/8" x 1"You 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

UL/ULC listed

In general

No screws need

28X Increased Efficiency

oxidation and deterioration

Simply cut a hole

And there are no metal parts that could lead to corrosion or oxidation within the filter

from the air stream

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

the A+2000 uses stage loading

Eliminates Filter Bypass

Available in packs of 4