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 then you'll need a 14-inch 14" Round Duct Pipe For 10 duct opening FR M 414 White

then you'll need a 14-inch round vent

+ Product Details Size - 8"w X 16"h X 2"d (for duct opening measurement only)

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

+ 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 then you'll need a 14 inch 14" Round Duct Pipe For 10 duct opening FR M 414 White then you'll need a 14 inch round vent + Product Details Size 8"w X 16"h X 2"d (for duct opening measurement only)