| 摘要 |
PURPOSE:To avoid the formation of a useless space for a heat exchanging ventilation fan, to miniaturize the fan and to reduce the thickness thereof by a method wherein blowers for supplying and discharging air are provided inside a cylindrical heat exchange element and a supply air current and an exhaust air current are introduced into an inner pipe and an outer pipe, respectively, of a double pipe duct. CONSTITUTION:The body 19 of a heat exchanging ventilation fan is provided on the inner surface of the wall 8 of a room. Further, a hole is drilled through the wall 8 so as to establish communication between the inside and the outside of the room and the double pipe duct 9 is inserted into the hole so as to connect to the body of the fan. With the above structure, the primary air current A is sucked into the center of the duct through an air supply opening 11 outside the room by a blower 10, passes through the cylindrical heat exchange element 12 and is supplied into the room through an air supply opening 13 inside the room. Further, the secondary air current B enters the heat exchange element 12 through an air discharge port 15 inside the room by the operation of a blower 14 and is discharged from an air discharge opening outside the room through the duct 9.
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