Rectangular Duct End Cap | 20" X 12" End Cap return grille Actual Filter Size – 17

Actual Filter Size – 17 3/4"w x 15 3/4" x 1"

These line set covers will protect your line sets from virtually any damage

Filter Size - 27

this air supply register is ideal for sidewall and ceiling applications

Rectangular Duct End Cap | 20" X 12" End Cap return grille Actual Filter Size – 17+ 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.