Merv 8 Pleated Air Filter - 11 1/2" x 29 1/2" x 1" Quantity:12-pack and the greater the pressure

and the greater the pressure drop it creates

Either way

the A+2000 uses no foam that may clog

The "Practical Pleat" media is up to 28 times more effective at capturing particles than standard fiberglass panel filters

Merv 8 Pleated Air Filter - 11 1/2" x 29 1/2" 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.