Rectangular Duct End Cap 24" X 8" End Cap 26-Gauge Galvanized Steel Metal Aluminum - Cube Core then you'll need a 14-inch

then you'll need a 14-inch round vent

+ Product Details Perfect Fit & Easy Sizing - Designed for a 30" x 28" OR 28" x 30" duct opening (measured at the opening)

+ Product Details Size – 8"w X 36"h is the size for the duct opening measurement only

6mm or Iron Plate below 1

75"H – fits a 10" X 10" duct opening

Rectangular Duct End Cap 24" X 8" End Cap 26-Gauge Galvanized Steel Metal Aluminum - Cube Core then you'll need a 14-inchAbout this item: MATERIAL QUALITY Our rectangular duct cap is made of high quality galvanized sheet metal material (galvanized steel construction for durability and rust prevention) SIZE & SPECS The size of a Duct End Cap is 24 X 8. 26 gauge galvanized steel end cap, rectangular shape. 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