Merv 11 Pleated Air Filter - 7 1/2" x 7 1/2" x 1" Quantity:12-pack these can be purchased in

these can be purchased in any conceivable size

In general

This is designed to fit into 1" Return Air Grilles

some just refer to them as electrostatic filters

than standard fiberglass filters purchased at retail outlets

Merv 11 Pleated Air Filter - 7 1/2" x 7 1/2" x 1" Quantity:12-pack these can be purchased inAny 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.