16"w X 20"h Aluminum Adjustable Return/Supply HVAC Air Grille Aluminum - Cube Core Energy Efficient – Air-tight inner

Energy Efficient – Air-tight inner core decreases the pressure loss and provides a more hygienic environment - high energy efficient / No fiberglass erosion into air stream

+ Product Details Size – 12"w X 24"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

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

actual front end outer dimensions are approximately 17

16"w X 20"h Aluminum Adjustable Return/Supply HVAC Air Grille Aluminum - Cube Core Energy Efficient – Air-tight inner+ 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