Reasonable choice of motor starting method damper model, must be based on the capacity of the power supply grid, the mechanical load on the starting torque requirements, characteristics of the motor itself and other factors, specific analysis damper, in order to obtain the specified start time. For example, a large capacity of the grid, the motor starting current does not cause a significant voltage drop in the power line, in addition, the grid lines and equipment allow short-time control through a sufficiently large starting current, can use full pressure start; if the fan torque at start-up is not required, and not in terms of grid capacity is relatively large electric motor, the main consideration how to reduce the starting current and the use of vacuum starter. Our attention to the credibility of automatic fire dampers to ensure product quality, focusing on small profits, rapid delivery, and after-sales service system 70 degrees fire dampers, fire dampers, ventilation equipment from Plumper Plumper Shandong Dezhou ventilation plant. Dezhou Plumper ventilation plant (www.frtfsb.com) strong, credible, in Dezhou fan, ventilation equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Plumper ventilation equipment into the brilliant and you work for a better future!