14"w X 34"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 15.75"w x 35.75"h] Color_R-4.2 Yellow + Product Details Size - Suitable for all AC 8in diameter 12125SDCLNGBX

+ Product Details Size - 30"w X 10"h is the size for the duct opening measurement only

+ Product Details Size – 28"w X 10"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 36" x 14" OR 14" x 36" duct opening (measured at the opening)

The total outer size of this grille is the listed size plus 2

14"w X 34"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 15.75"w x 35.75"h] Color_R 4.2 Yellow + Product Details Size Suitable for all AC 8in diameter 12125SDCLNGBX + Product Details Size 30"w X 10"h is the size for the duct opening measurement only + Product Details Size – 28"w X 10"h is the size for the duct opening measurement only