| 摘要 |
PURPOSE:To minimize a noise by providing sound absorbing materials installed in resisting plates facing in opposite to each other at the inlet of a vent top lower case and the ceiling of a vent top upper case. CONSTITUTION:An exhaust gas 2 passes an inlet 10 formed on the bottom of a vent top lower case 3 and makes contact with a sound absorbing material 11 mounted at a position on the side of a vent top lower case 3 in a resisting plate 4 provided on a vent top upper case 5. Thus, the exhaust gas 2 is sound- absorbed, and chambes its course to the right and left and advance toward the vent top upper case 5. Further, a sound absorbing material 9 is fitted in the vent top upper case 5, and the majority part of the exaust gas 2 is sound- absorbed again therein and is finally exhausted out of the apparatus through louver parts 6 and 7.
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