Side Outlet Ceiling Diffuser Box | 12" X 12" X 6" | Galvanized Steel Metal Box is Compatible with Duct 6" Merv 2 + Product Details Size - Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

+ Product Details Size - 22"w X 20"h is the size for the duct opening measurement only

+ Product Details Size - 4"W X 4"H is (for duct opening measurement only)

+ Product Details + Product Details Size – 18"w X 16"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 18 5/8" width X 28 5/8" height

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Side Outlet Ceiling Diffuser Box 12" X 12" X 6" Galvanized Steel Metal Box is Compatible with Duct 6" Merv 2 + Product Details Size Compatible With Duct 7in Applications This sheet metal DDAG A 1212 + Product Details Size 22"w X 20"h is the size for the duct opening measurement only + Product Details Size 4"W X 4"H is (for duct opening measurement only)