12"w X 18"h Aluminum Adjustable Return/Supply HVAC Air Grille - FULL CONTROL HORIZONTAL AIRFLOW DIRECTION Fixed Blades + Product Details Size -

+ Product Details Size - 10"w X 14"h is the size for the duct opening measurement only

The total outer size of this grille is the listed size plus 1

angle them down for effective warmth distribution

Slots are angled to diversify the airflow in 2 way direction

Width vs Height:

12"w X 18"h Aluminum Adjustable Return/Supply HVAC Air Grille - FULL CONTROL HORIZONTAL AIRFLOW DIRECTION Fixed Blades + Product Details Size -+ 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