A+2000 Washable Electrostatic Permanent Custom Air Filter - 18 3/4" x 21 3/4" x 1" Quantity:Default and the greater the pressure

and the greater the pressure drop it creates

No holes needed for installation in coil area

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

the A+2000 uses stage loading

A+2000 Washable Electrostatic Permanent Custom Air Filter - 18 3/4" x 21 3/4" x 1" Quantity:Default and the greater the pressureYou 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