| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a connection not causing short circuit of air supply and air exhaust by recognizing connection states and preventing gaps in connection portions wherein there is a problem that the connection states can not be recognized since the connection portions of an inner tube and a body, and the inner tube and a hood are in an interior of a wall body when the body is installed in an indoor side of a wind tunnel pipe communicating the indoors with the outdoors in a wall surface of a house, the hood is installed in an outdoor side, and a double pipe comprising an outer pipe and the inner pipe is connected in the wind tunnel pipe. <P>SOLUTION: By equipping a recognition means for recognizing that a body inner pipe 7 and a hood inner pipe 22 are connected by an inner pipe connection pipe 24 during construction, generation of the gaps between the inner pipe connection pipe 24 and the body inner pipe 7, and the inner pipe connection pipe 24 and the hood inner pipe 22 is prevented, and the concurrent supply and discharge type ventilation fan providing connection not causing short-circuiting of an air supply air duct 9 and an air exhaust air duct 8 can be obtained. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
