Rectangular Duct End Cap | 12" X 12" End Cap Aluminum Bar + Product Details Size –

+ Product Details Size – Size - Cuts 36mm & below

Actual Filter Size – 21 3/4"w x 13 3/4" x 1"

+ Product Details Size – 28"w X 8"h is the size for the duct opening measurement only

For a visual guide on how to measure your vent hole before ordering a grille

+ Product Details Perfect Fit & Easy Sizing - Designed for a 24" x 36" OR 36" x 24" duct opening (measured at the opening)

Rectangular Duct End Cap | 12" X 12" End Cap Aluminum Bar + Product Details Size –+ Product Details Size Duct end cap is 12" 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.