A+2000 Washable Electrostatic Permanent Custom Air Filter - 13 7/8" x 17 7/8" x 1" Quantity:Default these can be purchased in

these can be purchased in any conceivable size

In general

with each stage capturing progressively smaller particles inside the filter

the A+2000 uses stage loading

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A+2000 Washable Electrostatic Permanent Custom Air Filter - 13 7/8" x 17 7/8" x 1" Quantity:Default these can be purchased inYou 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