In a noncondensing gas furnace, what does the induced draft blower pull from?

The induced draft blower in a noncondensing gas furnace is responsible for pulling exhaust gases from the combustion chamber. This is a critical function as it ensures that any gases produced during the combustion process are effectively removed from the furnace to prevent backdrafting, which could pose hazards or affect efficiency. By maintaining a proper draft, the blower helps establish the necessary negative pressure within the combustion chamber, facilitating the efficient burning of gas and the safe expulsion of combustion byproducts.

The design of a noncondensing furnace typically requires that the combustion chamber operate under controlled pressure conditions, which the induced draft blower effectively supports. By pulling gases from this area, it helps optimize combustion and protect the overall integrity of the system. The role of the blower is not to draw from the other listed components, which serve different purposes within the gas furnace system. The gas manifold, for example, is where the gas is supplied for combustion; the heat exchanger is where heat transfer takes place; and the venting system is a separate pathway for expelled gases rather than a source for the induced draft blower.