... ,energy saving.applies for factories ,office,storage,dining room,the kitchen,basement to ventilate , exchange air and cool down.The Main ... -50500983502201.58501350FTA-50500982903800.63501350FA-606001706002202.7501350FTA-606001706003801.1501350FTA-757502658503801.350900 ventilation fan /solid and durable/energy saving/for exhaust air for ...