Merv 8 Pleated Air Filter - 21 1/2" x 23 1/4" x 1" Quantity:12-pack the greater it's resistance to

the greater it's resistance to airflow

the A+2000 uses no foam that may clog

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

They are easy to clean by simply backwashing every month with cold water so you don‰۪t need expensive cleaners

Merv 8 Pleated Air Filter - 21 1/2" x 23 1/4" x 1" Quantity:12-pack the greater it's resistance toAny 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.