Rectangular Duct End Cap | 14" X 14" End Cap 4" Round Duct Pipe + Product Details Size -

+ Product Details Size - 14"w X 10"h is the size for the duct opening measurement only

Actual Filter Size – 21 3/4"w x 15 3/4" x 1"

with actual outer dimensions of 16

But the benefits don't stop there

Actual Filter Size – 33 3/4"w x 15 3/4" x 1"

Rectangular Duct End Cap | 14" X 14" End Cap 4" Round Duct Pipe + Product Details Size -+ Product Details Size Duct end cap is 14" X 14" 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.