12"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Brown [Outer Dimensions 13.75"w x 13.75"h] Powder-Coated + Product Details Size - 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size - 32"w X 34"h is the size for the duct opening measurement only

Ideal for VAV systems

This grill comes in four different designs

+ Product Details Size – 36"w X 12"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 22 5/8" width X 52 5/8" height

12"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh Brown [Outer Dimensions 13.75"w x 13.75"h] Powder Coated + Product Details Size 4 X 12 Is CRFG2028 Width_14in + Product Details Size 32"w X 34"h is the size for the duct opening measurement only Ideal for VAV systems