30"w X 8"h Aluminum Adjustable Return/Supply HVAC Air Grille Insulated Line See chart below:

See chart below:

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if your hole is 20" wide by 14" tall

30"w X 8"h Aluminum Adjustable Return/Supply HVAC Air Grille Insulated Line See chart below:+ Product Details Size 30"w X 8"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 31. 85" width X 9. 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