Merv 13 Pleated Air Filter - 17 1/4" x 17 1/4" x 1" Quantity:12-pack Simply cut a hole

Simply cut a hole

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

And there are no metal parts that could lead to corrosion or oxidation within the filter

mold and other fungi

Merv 13 Pleated Air Filter - 17 1/4" x 17 1/4" x 1" Quantity:12-pack Simply cut a holeAny 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.