... fan: 12500m3/h.1×5.5KW double-intake centrifugal fan for exhaust air, model YDW4.5S, air capacity: 16000m3/h, with ... manual damper for exhaust air.Heating systemRIELLO G20 diesel burner, stainless steel heat exchanger ... .5S, air capacity is 15500 m3/h, with manual damper for exhaust air.Heating SystemRIELLO G10 oil burner, stainless steel heat exchanger ...