Rectangular Duct End Cap | 18" X 6" End Cap Compatible with Duct 4" C (Common): Black

C (Common): Black

Ideal for Walls & Ceilings: Designed for seamless installation in standard 8" X 4" duct openings

Actual Filter Size – 15 3/4"w x 31 3/4" x 1"

+ Product Details Size – 12" x 20" or 20" x 12" is the size for the duct opening measurement only

Applications – Suitable for cutting plastic

Rectangular Duct End Cap | 18" X 6" End Cap Compatible with Duct 4" C (Common): Black+ Product Details Size Duct end cap is 18" 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.