24"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 25.75"w x 19.75"h] w18h18 Engineered with precision and designed 4 X 12 Is CRFG2028 Width_14in

Engineered with precision and designed to perfection

These are built heavy duty for installation into brick and cement walls

+ Product Details Size - 22"w X 12"h is the size for the duct opening measurement only

+ Product Details Size - 18"w X 12"h X 2"d (for duct opening measurement only)

Actual Filter Size – 27 3/4"w x 9 3/4" x 1"

24"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 25.75"w x 19.75"h] w18h18 Engineered with precision and designed 4 X 12 Is CRFG2028 Width_14in Engineered with precision and designed to perfection These are built heavy duty for installation into brick and cement walls