| 摘要 |
PURPOSE:To restrain the temperature rising of an electric component box and reduce the apparatus operating noise, further, prevent the device from rain permeating by a method wherein an air ventilation duct is provided to cover the louver of a front cover, and to be extended to the lower part of the front cover. CONSTITUTION:A part of an air is sucked via opening parts 13a, 13b through a louver A9, then discharged from a lower end opening part 13c through a front duct 13, thus, the air is utilized for restraining the temperature rising of an electric circuit in an electric component box 7 by passing through the electric component box 7, further, utilized for the burning in a burner 1. The louver A9 is provided at only one place at the front part of a front cover 8, that is, at the lower part of a discharging top 6, accordingly, the temperature rising in the electric component box 7 is restrained due to the air sucking through the front duct 13 from the louver A9 even under wind blowing condition for long period of time, moreover, the cooling effect for both a discharging fan 5 and a circulating pump 12 can be obtained.
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