Side Outlet Ceiling Diffuser Box | 6" X 6" X 4" | Galvanized Steel Metal Box is Compatible with Duct 4" Supply Grille + Product Details Size -

+ Product Details Size - 24"w X 12"h is the size for the duct opening measurement only

Actual Filter Size – 21 3/4"w x 29 3/4" x 1"

actual front end outer dimensions are approximately 38 5/8" width X 26 5/8" height -

+ Product Details Size - 36"w X 34"h X 2"d (for duct opening measurement only)

actual front end outer dimensions are 29

Side Outlet Ceiling Diffuser Box | 6" X 6" X 4" | Galvanized Steel Metal Box is Compatible with Duct 4" Supply Grille + Product Details Size -+ Product Details Size & Compatibility The size of the side round ceiling box is 6" X 6" 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 square