Garage Door Exhaust Port Latching. Latching Exhaust Ports. Size indicated is the Inside Diameter of the hole and thickness of the door or application. 1st, Number is inside diameter. Gasket and hardware is included. Very easy to install. Good for use with cars, motorcycles, ATV's, generators and any machine that produces exhaust. Just run a hose (not included) from the exhaust through the port.