36"w X 28"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 29.75"h] Adjustable Return + Product Details Size – VF-WB 2x12 PB our damper helps create 6" Round Duct Pipe

+ Product Details Size – 25"w X 24"h is the size for the duct opening measurement only

Actual Filter Size – 9 3/4"w x 11 3/4" x 1"

+ Product Details Size – 16"w X 14"h is the size for the duct opening measurement only

High Quality – high-quality steel with counter-sunk screw holes (screws included) and no sharp edges

+ Product Details Size – 30"w X 16"h is the size for the duct opening measurement only

36"w X 28"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 37.75"w x 29.75"h] Adjustable Return + Product Details Size – VF WB 2x12 PB our damper helps create 6" Round Duct Pipe + Product Details Size – 25"w X 24"h is the size for the duct opening measurement only Actual Filter Size – 9 3 4"w x 11 3 4" x 1"