18x20x1 MERV 2 Non Pleated Air Filter Replacement Filters (Actual Size 17.75 x 19.75) - 3 Pack Aluminum even without needing to remove

even without needing to remove the thermostat

+ Product Details Size - 28"w X 28"h X 2"d (for duct opening measurement only)

+ Product Details Size – 25"w X 36"h is the size for the duct opening measurement only

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75"H – fits a 10" X 6" duct opening

18x20x1 MERV 2 Non Pleated Air Filter Replacement Filters (Actual Size 17.75 x 19.75) - 3 Pack Aluminum even without needing to remove+ Product Details 18" x 20" x 1" replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 17. 75" x 19. 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