draught fan

1. 通风风扇：draught excluder strip 密封条 | draught fan 通风风扇 | draught gauge 通风计

2. 通风机：draught engine 排水机 | draught fan 通风机 | draught flue 排气烟道

3. 透风风扇：draught excluder strip 稀启条 | draught fan 透风风扇 | draught gauge 通风计

4. 引风机,通风风扇：draught exclusion device ==> 防风措施 | draught fan ==> 引风机,通风风扇 | draught flue ==> 排气烟道