34"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 35.75"w x 37.75"h] ceiling + Product Details Perfect Fit Suitable for all AC 8in diameter 12125SDCLNGBX

+ Product Details Perfect Fit & Easy Sizing - Designed for a 14" x 10" or 10" x 14" duct opening (measured at the opening)

+ Product Details Size - 10"w X 12"h X 2"d (for duct opening measurement only)

The total outer size of this grille is the listed size plus plus 2 and 5/8"

actual front end outer dimensions are approximately 10 5/8" width X 8 5/8" height

34"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 35.75"w x 37.75"h] ceiling + Product Details Perfect Fit Suitable for all AC 8in diameter 12125SDCLNGBX + Product Details Perfect Fit & Easy Sizing Designed for a 14" x 10" or 10" x 14" duct opening (measured at the opening) + Product Details Size 10"w X 12"h X 2"d (for duct opening measurement only)