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

+ Product Details Size – 12"w X 18"h is the size for the duct opening measurement only

Insulation – A thick blanket of fiberglass insulation provides you with an R-Value of 8

actual front end outer dimensions are approximately 17

R Value Rating of Insulation - R3

16"w X 20"h Aluminum Adjustable Return/Supply HVAC Air Grille Aluminum - Cube Core + 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