Merv 8 Pleated Air Filter - 18" x 21" x 1" Quantity:12-pack and the greater the pressure

and the greater the pressure drop it creates

The "Practical Pleat" contains over 500% greater surface area than a MERV 10 one-inch pleat

these can be purchased in any conceivable size

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

Any Kind of Filter's Extended Surface Pleated Filters outperform ordinary furnace filters with medium efficiency and are designed for lower pressure drop

Merv 8 Pleated Air Filter - 18" x 21" x 1" Quantity:12-pack and the greater the pressureAny 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.