16"w X 20"h Aluminum Adjustable Return/Supply HVAC Air Grille Color_White + Product Details Size –

+ Product Details Size – 12"w X 4"h is the size for the duct opening measurement only

+ Product Details Size – 15" Corner Baseboard Grille - White - HVAC corner vent cover

while the ingenious dial-controlled damper empowers you to effortlessly regulate airflow using your foot

+ Product Details Size – 6" x 12" or 12" x 6" is the size for the duct opening measurement only

16"w X 20"h Aluminum Adjustable Return/Supply HVAC Air Grille Color_White + Product Details Size –+ 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