Merv 8 Pleated Air Filter - 30" x 36" x 1" Quantity:12-pack the greater it's resistance to

the greater it's resistance to airflow

PACK of 6 pads for Pad and Frame Air Filters

This is a 5" MERV 10 HIGH PERFORMANCE AIR FILTER

some just refer to them as electrostatic filters

Merv 8 Pleated Air Filter - 30" x 36" 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.