So the previous owner of my Ingersoll 224 decided to vent the top of the hood by cutting a hole and pop-riveting a HVAC louvered grill over it. I have considered filling in the hole with flat sheetmetal, but ventilation is certainly beneficial. I am thinking of doing something like this, but reversing the scoop so that the opening is in the back to let heat out. What have others done? Does anyone know of a pre-made scoop that might work? I would say my opening is about 10" side to side and 6" front to back.