18x24x1 MERV 2 Non Pleated Air Filter Replacement Filters (Actual Size 17.75 x 23.75) - 3 Pack Adjustable Return + Product Details Size -

+ Product Details Size - 34"w X 14"h is the size for the duct opening measurement only

+ Product Details Size & Compatibility – The size of sheet metal pipe is 10" round x 10' long

This 18" X 8" end cap is constructed with 26-gauge galvanized steel

+ Product Details Size - 16"w X 16"h is the size for the duct opening measurement only

+ Product Details Size & Compatibility – The size of the side round ceiling box is 8" X 8" X 5" and it is compatible with duct 5"

18x24x1 MERV 2 Non Pleated Air Filter Replacement Filters (Actual Size 17.75 x 23.75) - 3 Pack Adjustable Return + Product Details Size -+ Product Details 18" x 24" x 1" replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 17. 75" x 23. 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