| 摘要 |
PROBLEM TO BE SOLVED: To enhance safety of a heater during use by introducing a part of air from an air supply means to a place on the periphery of the heater where the temperature is raised upon installation of the heater thereby suppressing a temperature rise. SOLUTION: Cooling air ducts 15 are provided on the left and right in a housing 11 so that a part of outdoor air being taken in by an air supply means 13 is supplied, as cooling air, from the left and right side faces of the housing 11 to the outside, and a part of outdoor air is supplied, as cooling air, from the left and right side faces of the housing 11 to the outside through the cooling air ducts 15. According to the arrangement, a temperature rise can be suppressed on the periphery of a wall where the temperature is raised when the heater is heated.
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