18x12x1 MERV 2 Non Pleated Air Filter Replacement Filters (Actual Size 17.75 x 11.75) - 3 Pack Floor Grille Toe Space 40" x 16" Aluminum Spiral

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

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

Slots Are Angled to Diversify The Airflow In 2 Way Direction - Great for Wall and Floor & ceiling Applications

18x12x1 MERV 2 Non Pleated Air Filter Replacement Filters (Actual Size 17.75 x 11.75) - 3 Pack Floor Grille Toe Space 40" x 16" Aluminum Spiral+ 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