Merv 8 Pleated Air Filter - 19 1/4" x 19 1/4" x 1" Quantity:12-pack Either way

Either way

This design enables A+2000 custom air filters to maintain performance over the years

28X Increased Efficiency

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

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Merv 8 Pleated Air Filter - 19 1/4" x 19 1/4" 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.