Which of the following best describes induced draft blower motors' function?

Induced draft blower motors play a crucial role in the operation of heating systems, particularly in ensuring safe and efficient removal of combustion byproducts from the heating appliance. Their primary function is to create a negative pressure within the combustion chamber or heat exchanger, effectively drawing air into the furnace to support combustion while simultaneously exhausting combustion gases out of the flue. This mechanism enhances the efficiency of the combustion process and helps maintain safety by preventing hazardous gases, such as carbon monoxide, from escaping into the living space.

The other options do not accurately describe this critical function. While some motors within HVAC systems may circulate air or cool components, these are not the primary roles of the induced draft blower. Regulating gas flow is also not a function of the induced draft blower; this task is typically managed by gas valves or regulators, which control the supply of gas to the burner. Thus, option C succinctly captures the essential function of induced draft blower motors.