forced draft ventilation

例句：

1. 1. The building is designed with forced draft ventilation to improve air circulation.
   这座建筑设计有强制通风系统以改善空气流通。
2. 2. In the event of a fire, the forced draft ventilation system will kick in to expel smoke and heat.
   在发生火灾的情况下，强制通风系统将启动以排出烟雾和热量。
3. 3. The engineers are working on improving the forced draft ventilation system for better indoor air quality.
   工程师们正在努力改进强制通风系统，以改善室内空气质量。