A+2000 Washable Electrostatic Permanent Custom Air Filter - 29 3/4" x 36" 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

To find the size the old unit should have sizing information printed on it

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Some of the other benefits of A+2000 custom air filters include the following

In general

with each stage capturing progressively smaller particles inside the filter

This is designed to fit into 1" Return Air Grilles

oxidation and deterioration

from the air stream

One way to overcome this problem is to increase the surface area of the filter media

Unlike some permanent custom air filters

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