Merv 13 Pleated Air Filter - 9 1/8" x 9 1/8" x 1" Quantity:12-pack if not you can measure

if not you can measure it or check the HVAC unit and the owner‰۪s manual

To order washable electrostatic custom air filters you just need to know the size of the current air filter

we even have the odd sizes

Unlike some permanent custom air filters

In general

Merv 13 Pleated Air Filter - 9 1/8" x 9 1/8" x 1" Quantity:12-pack if not you can measureAny 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.