Equipped with a naturally aspirating gas burner, a draft hood, a solenoid-operated main gas valve, a continuously operating pilot light (standing-pilot), a thermocouple safety device, a 24-volt AC transformer, a heat exchanger, a blower and motor assembly, and one or more air filters. The standing-pilot is the main distinguishing characteristic of the low-efficiency conventional gas furnace.

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1. Equipped with a naturally aspirating gas burner, a draft hood, a solenoid-operated main gas valve, a continuously operating pilot light (standing-pilot), a thermocouple safety device, a 24-volt AC transformer, a heat exchanger, a blower and motor assembly, and one or more air filters. The standing-pilot is the main distinguishing characteristic of the low-efficiency conventional gas furnace.

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12'
Consists of a furnace, a blower fan, controls, a duct distribution system, and supply and return registers. The heating system warms the air, and the air is forced through ducts or pipes into rooms throughout the building. The cool air returns through the ducts and back to the furnace, where it is re-heated. And the cycle begins again. - - Some large homes have balancing problems. Certain rooms may feel colder than the rest of the house. This problem can be solved in a few ways. One is by dividing the heating system into two separate zones, with each controlled by its own thermostat. You may find a motorized damper installed in the duct system that is controlled by a thermostat. Zoning equipment can be expensive. Usually, a system can be balanced manually by adjusting the supply dampers installed inside the main supply ducts, and by using the dampers at the warm-air outlets (lever-controlled dampers, floor diffusers, or registers). -
Standing-Pilot gas furnace

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