Merv 8 Pleated Air Filter - 21" x 36 1/4" x 2" Quantity:12-pack the greater it's resistance to

the greater it's resistance to airflow

The A+2000 line is easy to maintain with no need to buy oils or adhesives to enhance effectiveness

mold and other fungi

28X Increased Efficiency

Either way

Merv 8 Pleated Air Filter - 21" x 36 1/4" x 2" 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.