Merv 11 Pleated Air Filter - 6" x 11" x 1" Quantity:12-pack the greater it's resistance to

the greater it's resistance to airflow

with each stage capturing progressively smaller particles inside the filter

we even have the odd sizes

the more efficient a filter is at removing particles

Keeps HVAC system cleaner and more efficient

Merv 11 Pleated Air Filter - 6" x 11" x 1" Quantity:12-pack the greater it's resistance toAny 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.