Lennox 13H04 Rollout Switch 340°F

The Lennox 13H04 Rollout Switch is a safety feature that is installed in HVAC systems to avoid overheating and hazardous fires. This switch measures the temperature in the vicinity of the burner area and if it rises to 340 degrees Fahrenheit, the furnace is turned down. Its major function is to sense flame rollout, a situation where the flame zone extends to the surface of the combustion chamber after burner zone, a sign of blockage or burner failure. This switch is mainly applied in the home and business furnaces to guarantee safety in operation.