Water-cooled, generators should have a strainer on the intake to keep out debris. They need enough ventilation, measured in cubic feet per minute (cfm) of air, for peak efficiency. It's best if the genset's exhaust system isn't shared with that of the engine's. Check the manufacturer's specs. It's helpful to have an ignition switch, plus gauges for oil pressure and temperature, in the engine compartment as well as at the control panel.