18x12x1 MERV 2 Non Pleated Air Filter Replacement Filters (Actual Size 17.75 x 11.75) - 3 Pack Floor Grille Toe Space + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 6" x 14" or 14" x 6" duct opening (measured at the opening)

Design – Circular air supply valves - designed to be used in low and medium pressure ventilation air conditioning systems

40" x 16" Aluminum Spiral Duct Air Vent Grille Cover - Fully Adjustable Double Deflection HVAC Air Supply

+ Product Details Size - 28"W X 8"H is (for duct opening measurement only)

18x12x1 MERV 2 Non Pleated Air Filter Replacement Filters (Actual Size 17.75 x 11.75) - 3 Pack Floor Grille Toe Space + Product Details Perfect Fit+ Product Details 18" x 12" x 1" replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 17. 75" x 11. 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