Merv 8 Pleated Air Filter - 16 1/2" x 21 1/2" x 1" Quantity:12-pack The permanent frame is constructed

The permanent frame is constructed of space-age plastics that are resistant to corrosion

And there are no metal parts that could lead to corrosion or oxidation within the filter

degrade and restrict air flow

the A+2000 uses no foam that may clog

This design enables A+2000 custom air filters to maintain performance over the years

Merv 8 Pleated Air Filter - 16 1/2" x 21 1/2" x 1" Quantity:12-pack The permanent frame is constructedAny Kind of Filter's Extended Surface Pleated Filters outperform ordinary furnace filters with medium efficiency and are designed for lower pressure drop, and long service life which reduces HVAC equipment maintenance and energy costs. 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.