Rectangular Duct End Cap | 12" X 4" End Cap Ducting Components Actual Filter Size – 13

Actual Filter Size – 13 3/4"w x 13 3/4" x 1"

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+ Product Details Size – 20" X 20" is the size for the drywall opening measurement only

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+ Product Details Size & Compatibility – The size of galvanized sheet metal straight floor boot is 8" X 6" X 4"

Rectangular Duct End Cap | 12" X 4" End Cap Ducting Components Actual Filter Size – 13+ Product Details Size Duct end cap is 12" X 4" 26 gauge galvanized steel end cap, rectangular shape. Premium Quality Our rectangular duct cap is made of high quality galvanized sheet metal material (galvanized steel construction for durability and rust prevention). Made in the USA. Applications The product is used for stopping all types of fittings and also used to terminate a rectangular duct run in an HVAC application with a rectangular duct cap.