A+2000 Washable Electrostatic Permanent Custom Air Filter - 18" x 19 1/2" x 1" Quantity:Default and the greater the pressure

and the greater the pressure drop it creates

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A higher MERV rating means that the air filter that you are about to purchase possesses a higher amount impurity filtration ability than your ordinary filter

we even have the odd sizes

the greater it's resistance to airflow

A+2000 Washable Electrostatic Permanent Custom Air Filter - 18" x 19 1/2" 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