12" X 12" [Duct Opening] 2-Way Horizontal Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 13.75"H] w36h36 + Product Details Size - Ducting Components RG2016 FBA-HP Applications The C box

+ Product Details Size - 16"w X 14"h is the size for the duct opening measurement only

+ Product Details Size - 30"w X 22"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 34 5/8" width X 26 5/8" height

padding: 14px 14px

+ Product Details Size – 16"w X 30"h is the size for the duct opening measurement only

12" X 12" [Duct Opening] 2 Way Horizontal Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 13.75"H] w36h36 + Product Details Size Ducting Components RG2016 FBA HP Applications The C box + Product Details Size 16"w X 14"h is the size for the duct opening measurement only + Product Details Size 30"w X 22"h is the size for the duct opening measurement only