20"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 17.75"h] Copper Coil engineered for seamless 360-degree airflow 4 X 12 Is CRFG2028 Width_14in

engineered for seamless 360-degree airflow in T-bar ceilings

Actual Filter Size – 13 3/4"w x 19 3/4" x 1"

12"w X 8"h Is The Size For The Duct Opening Measurement Only

+ Product Details Size – 12" x 24" or 24" x 12" is the size for the duct opening measurement only

+ Product Description Maximize the efficiency of your ventilation system with our top-of-the-line HVAC grilles and registers

20"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 21.75"w x 17.75"h] Copper Coil engineered for seamless 360 degree airflow 4 X 12 Is CRFG2028 Width_14in engineered for seamless 360 degree airflow in T bar ceilings Actual Filter Size – 13 3 4"w x 19 3 4" x 1"