Assertion: furnace | /r/HasAspect | four main parts
Facets:
Source sentences:
text: A furnace has four main parts: the burner or combustion chamber, where natural gas or another fuel is burned; the heat exchanger, where the heat from the burner—but not the potentially dangerous gases produced by combustion—transfers to the home's air supply; the blower, which forces the heated air through ducts into the home; and the flue or vent, which carries combustion gases such as carbon monoxide to the outside.