Merv 8 Pleated Air Filter - 14 1/2" x 18 1/2" x 1" Quantity:12-pack A higher MERV rating means

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

than standard fiberglass filters purchased at retail outlets

This is a 5" MERV 10 HIGH PERFORMANCE AIR FILTER

This is designed to fit into 1" Return Air Grilles

Merv 8 Pleated Air Filter - 14 1/2" x 18 1/2" x 1" Quantity:12-pack A higher MERV rating meansAny 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.