Merv 11 Pleated Air Filter - 11 1/2" x 28 1/2" x 1" Quantity:12-pack The permanent frame is constructed

The permanent frame is constructed of space-age plastics that are resistant to corrosion

with each stage capturing progressively smaller particles inside the filter

åÊWe look forward to delivering our American-made

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

This is designed to fit into 1" Return Air Grilles

Merv 11 Pleated Air Filter - 11 1/2" x 28 1/2" x 1" Quantity:12-pack The permanent frame is constructedAny 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.