A+2000 Washable Electrostatic Permanent Custom Air Filter - 27 5/8" x 29 7/8" 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

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

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

than standard fiberglass filters purchased at retail outlets

so it can provide a lifetime of dependable service

You never have to hassle with disposable filters that will end up in a landfill again

This design enables A+2000 custom air filters to maintain performance over the years

Either way

degrade and restrict air flow

The permanent frame is constructed of space-age plastics that are resistant to corrosion

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

some just refer to them as electrostatic filters

Available in packs of 4