36"w X 32"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 33.75"h] Aluminum Dimensions With Outer End are 4 X 12 Is CRFG2028 Width_14in

Dimensions With Outer End are 9

+ Product Details Size - 20"w X 12"h X 2"d (for duct opening measurement only)

+ Product Details Size - 12"w X 12"h Is The Size For The Duct Opening Only

actual front end outer dimensions are approximately 32 5/8" width X 12 5/8" height

+ Product Details Perfect Fit & Easy Sizing - Designed for a 34" x 16" Or 16" x 34" duct opening (measured at the opening)

36"w X 32"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 37.75"w x 33.75"h] Aluminum Dimensions With Outer End are 4 X 12 Is CRFG2028 Width_14in Dimensions With Outer End are 9 + Product Details Size 20"w X 12"h X 2"d (for duct opening measurement only)