| "four stair" furnaces.
The burner manifold ignites and releases heat into a heat exchanger. Inside air is circulated through the heat exchanger, removing heat and passing it into your house. There is a balance that must be maintained. If the flow of this inside air through the heat exchanger is reduced, then the heat exchanger will overheat and begin to deteriorate. However, a high temperature switch should tell the burner gas valve to shut off the gas and stop the burning but you won't have a comfortable house.
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