A+2000 Washable Electrostatic Permanent Custom Air Filter - 27 1/2" x 29 1/2" x 1" Quantity:Default They are easy to install

They are easy to install with custom air filters made to the sizes that you specify

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

This is designed to fit into 1" Return Air Grilles

the A+2000 uses stage loading

A+2000 Washable Electrostatic Permanent Custom Air Filter - 27 1/2" x 29 1/2" x 1" Quantity:Default They are easy to installYou 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