Merv 8 Pleated Air Filter - 16 1/2" x 21 1/2" x 1" Quantity:12-pack the greater it's resistance to

the greater it's resistance to airflow

One way to overcome this problem is to increase the surface area of the filter media

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 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.