| 摘要 |
PROBLEM TO BE SOLVED: To lower temperature in a building cover by smoothly discharging cooled air heated out of the building cover. SOLUTION: An exhaust pipe 12, a muffler 13, etc., rising to a high temperature are arranged on the upper part side of an engine 6 and constituted to provide an exhaust duct 23 to discharge cooled air sucked by a cooling fan at a position to cover the exhaust pipe 12, the muffler 13, etc., on the building cover 18. Consequently, it is possible to supply the cooled air passing a heat exchanger toward the exhaust pipe 12, the muffler 13, etc., which become high temperature and to cool their heat source by the cooled air. Additionally, as the heated cooling air rises in the inside of the building cover 18 by natural convection after the cooling fan stops, it is possible to smoothly discharge the high temperature cooled air outside from the exhaust duct 23.
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