36"w X 8"h Aluminum Adjustable Return/Supply HVAC Air Grille steel With these options

With these options

4" X 12" Is The Size For The Duct Opening (floor/vent hole) Measurement Only

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+ Product Details Size – 12"w X 24"h is the size for the duct opening measurement only

High Quality – High-quality

36"w X 8"h Aluminum Adjustable Return/Supply HVAC Air Grille steel With these options+ Product Details Size 36"w X 8"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 37. 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