| 摘要 |
PURPOSE:To actively/sufficiently suck/exhaust outdoor air through plural introducing ports by an exhaust duct having the work of a ventilating fan, in a simple constitution. CONSTITUTION:In the exhaust duct introducing the outdoor air into the exhaust duct 22 from a one end introducing port 23 by the ventilating fan 21 and exhausting the outdoor air, an air current separating part 25 separating, at least, a main current in an exhaust current in the exhaust duct 22 from the internal surface of the exhaust duct 22 by a sudden change in the shape of a path is provided on mid-way of the exhaust duct 22 and another introducing port 24 is provided on a part corresponding to an air current separating area S where the separation of the air current is generated by the air current separating part 25 of the exhaust duct 22, as well. |
