Rectangular Duct End Cap | 20" X 6" End Cap with filter a starting collar is installed

a starting collar is installed for attaching a straight or split fitting for the ducts

actual front end outer dimensions are approximately 22 5/8" width X 8 5/8" height

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actual front end outer dimensions are approximately 20 5/8" width X 18 5/8" height

Rectangular Duct End Cap | 20" X 6" End Cap with filter a starting collar is installed+ Product Details Size Duct end cap is 20" X 6" 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.