Merv 8 Pleated Air Filter - 17 1/2" x 20 1/2" x 1" Quantity:12-pack Finally they are factory made

Finally they are factory made so you don‰۪t have to deal with the hassle of trying to cut and size your custom air filters and they come with a full warranty

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This is designed to fit into 1" Return Air Grilles

One way to overcome this problem is to increase the surface area of the filter media

than standard fiberglass filters purchased at retail outlets

Merv 8 Pleated Air Filter - 17 1/2" x 20 1/2" x 1" Quantity:12-pack Finally they are factory madeAny 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.