Rectangular Duct End Cap | 18" X 10" End Cap Color_Black actual front end outer dimensions

actual front end outer dimensions are approximately 16 5/8" width X 18 5/8" height

+ Product Details Size - 36"w X 10"h X 2"d (for duct opening measurement only)

visible representation of your air system

Designed for both walls and ceilings

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 36" or 36" x 12" duct opening (measured at the opening)

Rectangular Duct End Cap | 18" X 10" End Cap Color_Black actual front end outer dimensions+ Product Details Size Duct end cap is 18" 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.