平衡通风 meaning in English

balanced draft
balanced ventilation
equilibrium draft

Boiler : subcritical , intermediate reheat , double u flame balance draft . controlled coal firing circulation drum type boiler with a rated evaporating capacity of 1081 . 2t . h manufactured by spain b w company using technologies form stein , france
锅炉：西班牙b w公司采用法国stein公司技术生产的亚临界中间再热w型火焰平衡通风控制循环燃煤汽包炉。