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 Size - RFG3024 Black HP const content item Hi-Lo Oval Stack Head

+ Product Details Size - 34"w X 24"h is the size for the duct opening measurement only

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

+ Product Details Size - 12"w X 36"h X 2"d (for duct opening measurement only)

+ 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"

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 Size RFG3024 Black HP const content item Hi Lo Oval Stack Head + Product Details Size 34"w X 24"h is the size for the duct opening measurement only + Product Details Size 12"w X 10"h X 2"d (for duct opening measurement only)