36"w X 24"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 25.75"h] w12h12 + Product Details Size – MFFG810-1 Product Details Size 20 Compatible with Duct 3"

+ Product Details Size – 10" x 14" or 14" x 10" is the size for the duct opening measurement only

+ Product Details Size – 12"w X 20"h is the size for the duct opening measurement only

+ Product Details Size - 16"w X 10"h is the size for the duct opening measurement only

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Actual Filter Size – 15 3/4"w x 33 3/4" x 1"

36"w X 24"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 37.75"w x 25.75"h] w12h12 + Product Details Size – MFFG810 1 Product Details Size 20 Compatible with Duct 3" + Product Details Size – 10" x 14" or 14" x 10" is the size for the duct opening measurement only + Product Details Size – 12"w X 20"h is the size for the duct opening measurement only