| 摘要 |
PURPOSE:To simplify ocnstruction by a method wherein opposite-end flange connection parts of a telescopic bellows duct connecting with an indoor-air discharge port and an outside-air intake port of an outer casing of a main body and making them communicate with the outside of a room are constructed by the calking joint of a tongue piece to the opposite ends of a telescopic base. CONSTITUTION:A rectangular duct connection flange 26 is fitted removably to an indoor-air discharge port and an outside-air intake port which are opened in the rear part of an outer casing of a main body made up of decorative covers 21 and 22, and is connected to an intake-exhaust box 27 by a telescopic bellows duct 28. The connection to the flange 26 is made in such a manner that a flange connection part 28a of the telescopic bellows duct 28 is inserted into and pressed against an upper hook groove of the flange 26 and held therein removably by a clip of the flange. The flange connection part 28a, which is provided at the opposite ends of the duct 28, is a calking part made up of two engagement pieces 28c formed in the opposite ends of a telescopic base and of one tongue piece 28, and calking joint is so made that the end parts of the telescopic base is embraced. In this way, the construction of the telescopic bellows duct is simplified and an assembling operation therefor is facilitated. |
