Merv 8 Pleated Air Filter - 20" x 25 1/8" x 1" Quantity:12-pack Either way

Either way

Filtering inserts are anti-microbial and are more efficient in capturing particles

the greater it's resistance to airflow

some just refer to them as electrostatic filters

Merv 8 Pleated Air Filter - 20" x 25 1/8" x 1" Quantity:12-pack Either wayAny 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.