Merv 11 Pleated Air Filter - 23 1/2" x 29 1/2" x 1" Quantity:12-pack This is designed to fit

This is designed to fit into 1" Return Air Grilles

the "A+2000" brand Permanent Washable Electrostatic custom air filters are truly quality products

The filtering media consists of two layers of Stainless Steel roll formed baffles

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

Merv 11 Pleated Air Filter - 23 1/2" x 29 1/2" x 1" Quantity:12-pack This is designed to fitAny 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.