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HEATING AND VENTILATION DESCRIPTION AND OPERATION 80-11 Sectioned view of FBH unit 1 Combustion air fan 8 Evaporator 10 Circulation pump The FBH unit consists of: l A circulation pump. l A combustion air fan. l A burner housing. l An ECU/heat exchanger. l An air inlet hose. l An exhaust pipe. Circulation pump. The circulation pump is installed at the coolant inlet to the FBH unit to assist the coolant flow through Combustion air fan. The combustion air fan regulates the flow of air into the unit to support combustion of the fuel |