12"w X 18"h Aluminum Adjustable Return/Supply HVAC Air Grille - FULL CONTROL HORIZONTAL AIRFLOW DIRECTION Aluminum - Cube Core See chart below:

See chart below:

+ Product Details Size – 12"w X 8"h is the size for the duct opening measurement only

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10"w X 4"h Is The Size For The Duct Opening Measurement Only

12"w X 18"h Aluminum Adjustable Return/Supply HVAC Air Grille - FULL CONTROL HORIZONTAL AIRFLOW DIRECTION Aluminum - Cube Core See chart below:+ Product Details Size 12"w X 18"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 85" width X 19. 85" height. High Quality Rigid aluminum construction with counter sunk screw holes (screws included) and no sharp edges. Installation Location Sidewall and ceiling. Design Unrestricted airflow for your HVAC system adjustable one way louver with full horizontal airflow directional control single