This grill matches the Cabinet Vent and is surface mounted over a 3 to 3 1/4 inch (80mm) hole. It is perfect for mating with the Cabinet Vent products or helping to increase the natural airflow in cabinetry.Installation-1.Determine location for the grill ensuring that there will not be any obstructions inside the cabinet,2.Using a hole saw, drill a 3 to 3 1/4 inch (80mm) hole in the cabinet,3.Using the grill as a template, place it over the hole and mark the 4 screw holes and pre-drill those with a small drill bit (smaller than the screws),4.Screw grill to the cabinet.