Side Outlet Ceiling Diffuser Box | 12" X 12" X 4" | Galvanized Steel Metal Box is Compatible with Duct 4" Mounting Bracket Actual Filter Size – 13

Actual Filter Size – 13 3/4"w x 29 3/4" x 1"

+ Product Details Size – 20" x 26 or 26" x 20" is the size for the duct opening measurement only

The round side is crimped for easy insertion

Design – These Supply Diffusers with integral round necks are recommended for heating

+ Product Details Size - 24"w X 26"h is the size for the duct opening measurement only

Side Outlet Ceiling Diffuser Box | 12" X 12" X 4" | Galvanized Steel Metal Box is Compatible with Duct 4" Mounting Bracket Actual Filter Size – 13+ Product Details Size & Compatibility The size of the side round ceiling box is 12" X 12" X 4" and it is compatible with duct 4". Premium Quality Made in the USA. Our Galvanized Duct Box is made of high quality 26 Gauge galvanized sheet metal for durability. It features a snap lock design for easy fitting and a secure connection. Applications This sheet metal register duct ceiling outlet box is used for a 90 degree connection of round pipe to a