32"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 33.75"w x 19.75"h] Curved Blade Steel + Product Details Size – 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size – 28"w X 26"h is the size for the duct opening measurement only

Actual Filter Size – 25 3/4"w x 7 3/4" x 1"

+ Product Details Size - 8"w X 30"h is the size for the duct opening measurement only

+ Product Details Size - 22"w X 18"h X 2"d (for duct opening measurement only)

rust-free aluminum construction with smooth finished edges and counter-sunk screw holes (screws included)

32"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 33.75"w x 19.75"h] Curved Blade Steel + Product Details Size – 4 X 12 Is CRFG2028 Width_14in + Product Details Size – 28"w X 26"h is the size for the duct opening measurement only Actual Filter Size – 25 3 4"w x 7 3 4" x 1"