Merv 13 Pleated Air Filter - 9" x 21 1/8" x 1" Quantity:12-pack In general

In general

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the more efficient a filter is at removing particles

and the greater the pressure drop it creates

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

Merv 13 Pleated Air Filter - 9" x 21 1/8" x 1" Quantity:12-pack In generalAny 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.