12x18x1 MERV 2 Non Pleated Air Filter Replacement Filters (Actual Size 11.75 x 17.75) - 3 Pack w8h8 + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 26" OR 26" x 18" duct opening (measured at the opening)

With a 9-inch size

+ Product Details Size & Compatibility – The size of galvanized sheet metal straight floor boot is 10" X 6" X 5"

finished in polished brass

+ Product Details Size & Compatibility – The size of galvanized sheet metal straight floor boot is 14" X 4" X 8"

12x18x1 MERV 2 Non Pleated Air Filter Replacement Filters (Actual Size 11.75 x 17.75) - 3 Pack w8h8 + Product Details Perfect Fit+ Product Details 12" x 18" x 1" replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 11. 75" x 17. 75") A unique combination of cotton & synthetic fibers gives you the most filtration and the least air resistance equals great air & easy airflow for your system. The non pleated design provides low airflow resistance while still effectively capturing dirt and particles such as standing dust, spray paint