18x30x1 MERV 2 Non Pleated Air Filter Replacement Filters (Actual Size 17.75 x 29.75) - 3 Pack flat stamped steel designed for superior airflow (up

designed for superior airflow (up to 95%) and easy filter access

+ Product Details Size - 28"w X 4"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 14" x 8" or 8" x 14" duct opening (measured at the opening)

+ Product Details 16" x 20" x 1" replacement air filters for your furnace

18x30x1 MERV 2 Non Pleated Air Filter Replacement Filters (Actual Size 17.75 x 29.75) - 3 Pack flat stamped steel designed for superior airflow (up+ Product Details 18" x 30" x 1" replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 17. 75" x 29. 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