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Turn on clothes dryers and any appliance not connected to the common venting system. Turn on exhaust fans, such as range hoods and bathroom exhausts, so they will operate at maximum speed. Do not operate a summer exhaust fan. Close fireplace dampers. 4. Following the lighting instructions, place the unit being inspected in operation. Adjust the thermostat so the appliance will operate continuously. 5. Test for spillage at the draft control relief opening after 5 minutes of main burner operation.