14"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 15.75"w x 27.75"h] Fixed Blades with Damper + Product Details Size - Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

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

please note that the total outer dimensions of the grille measure 10" in diameter

+How To Measure A Grille Overall Size:

then you'll need a 14-inch round vent

+ Product Details Size - 8"w X 12"h X 2"d (for duct opening measurement only)

14"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 15.75"w x 27.75"h] Fixed Blades with Damper + Product Details Size Compatible With Duct 7in Applications This sheet metal DDAG A 1212 + Product Details Size 34"w X 24"h is the size for the duct opening measurement only please note that the total outer dimensions of the grille measure 10" in diameter