TM5-4120-387-14g.During periods of very cold weather the fabric cover should be rolled downand snapped.NOTEFresh (outside) air cannot be introduced with fabric coverrolled down.Close damper.Figure 2-14. Fabric CoverNOTEAn overheat thermostat located nearturn them off if the temperature inreaches an excessive level.the heating elements willthe heater compartment2-26