Merv 11 Pleated Air Filter - 19 1/4" x 25" x 1" Quantity:12-pack Either way

Either way

They are easy to clean by simply backwashing every month with cold water so you don‰۪t need expensive cleaners

They are easy to install with custom air filters made to the sizes that you specify

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 11 Pleated Air Filter - 19 1/4" x 25" x 1" Quantity:12-pack Either wayAny 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.