A+2000 Washable Electrostatic Permanent Custom Air Filter - 21 1/2" x 21 1/2" 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

PACK of 6 pads for Pad and Frame Air Filters

The secret behind the A+2000‰۪s custom air filters performance is the patented stage loading/peak and valley design

built to last a lifetime

The "Practical Pleat" contains over 500% greater surface area than a MERV 10 one-inch pleat

åÊWe look forward to delivering our American-made

In general

This is a 5" MERV 10 HIGH PERFORMANCE AIR FILTER

with each stage capturing progressively smaller particles inside the filter

oxidation and deterioration

This is designed to fit into 1" Return Air Grilles

Either way

the more efficient a filter is at removing particles