A+2000 Washable Electrostatic Permanent Custom Air Filter - 21" x 27" x 1" Quantity:Default than standard fiberglass filters purchased

than standard fiberglass filters purchased at retail outlets

oxidation and deterioration

degrade and restrict air flow

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

A+2000 Washable Electrostatic Permanent Custom Air Filter - 21" x 27" x 1" Quantity:Default than standard fiberglass filters purchasedYou 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