Rectangular Duct End Cap | 20" X 12" End Cap Compatible with Duct 6" getting new filters is a

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+ Product Details Size & Compatibility – The 7" Galvanized Sheet Metal 90 Degree Oval Vertical Angle Elbow is compatible with Duct 7"

+ Product Details Size - 28"w X 32"h is the size for the duct opening measurement only

Rectangular Duct End Cap | 20" X 12" End Cap Compatible with Duct 6" getting new filters is a+ Product Details Size Duct end cap is 20" X 12" 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.