16"w X 20"h Aluminum Adjustable Return/Supply HVAC Air Grille Color_White Just run your finger along

Just run your finger along the edge of the top plate and you will find a smooth finished surface

+ Product Details Size – 30"w X 10"h is the size for the duct opening measurement only

+ Product Details Size - 6"w X 6"h is the size for the duct opening measurement only

For example

16"w X 20"h Aluminum Adjustable Return/Supply HVAC Air Grille Color_White Just run your finger along+ Product Details Size 16"w X 20"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 17. 85" width X 21. 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