Rectangular Duct End Cap | 26" X 10" End Cap 5" Diameter + Product Details Size –

+ Product Details Size – 14" x 36" or 36" x 14" is the size for the duct opening measurement only

+ Product Details Size – 24"w X 24"h

But for the most part

Solid Rigid Steel Body For Durability and Reliability With Dampers Operate-able by Switch For Airflow Directional Control

+ Product Details Perfect Fit & Easy Sizing - Designed for a 22" x 28" OR 28" x 22" duct opening (measured at the opening)

Rectangular Duct End Cap | 26" X 10" End Cap 5" Diameter + Product Details Size –+ Product Details Size Duct end cap is 26" X 10" 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.