What is the use of two-speed fan?
The two-speed fan just to overcome this shortcoming, usually as an exhaust fan running, the problem can be found and be repaired in time, always in a good state of preparation.
If the exhaust and smoke control is completely separate from the two systems, and the fire exhaust fan is only in the event of a fire when it is put into operation, usually rarely used, then the failure is difficult to be found and be timely repair, and real fire , And it is difficult to ensure the smooth use of
Under normal circumstances, the fan running at low speed as exhaust ventilation, when a fire occurs, the fan immediately become high-speed operation, as a fire exhaust fan use. This machine with two, not only reduce the construction cost, save space, more importantly, greatly improve the efficiency of the use of equipment and reliability
So we use in the underground garage two-speed fan, which is the same fan and the same duct.
As the basement by the underground conditions and space constraints, to meet the air volume and wind pressure and other parameters of the conditions, the fire exhaust system and the usual ventilation can be combined
