Merv 11 Pleated Air Filter - 6" x 24" x 1" Quantity:12-pack some just refer to them

some just refer to them as electrostatic filters

The permanent frame is constructed of space-age plastics that are resistant to corrosion

They are easy to install with custom air filters made to the sizes that you specify

Available in packs of 4

The "Practical Pleat" contains over 500% greater surface area than a MERV 10 one-inch pleat

Merv 11 Pleated Air Filter - 6" x 24" x 1" Quantity:12-pack some just refer to themAny 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.