The fan room unit involves the field of marine ventilation and air exchange. Specifically, the design of the axial flow fan impeller and cylinder adopts the patented technology of efficient and low noise axial flow impeller (CN206175308U) and the patented technology of axial backward inclined guide vane fan (CN211259142U), based on the international dimensions of the ship ventilation field and the standard specifications of marine axial flow fans, combined with the research and development direction and needs of the service ship field.