| 摘要 |
PROBLEM TO BE SOLVED: To prevent occurrence of trouble in the case of an obstacle exists in front of an outlet of warm air. SOLUTION: Warm air generated by burning fuel by a burner 11 is let out into a room from an outlet 16 by a convection fan 12. The inside of the room communicates with a combustion chamber 14 through a duct part 19. A duct opening 22 of the duct 19 on the side of the combustion chamber 14 and a duct opening 24 on the door side are provided respectively with duct guides. A temperature detector 20 is provided in the duct part 19, to let the warm air collided with an obstacle flow into the duct part 19. The detector 20 detects the temperature of the duct part 19, a signal output from the detector operates a controller 18 to alarm on the existence of the obstacle, or stops the warm air operation, and deformation of means for sending warm-air and degradation in its durability, or exposure of the obstacle to a high temperature is prevented.
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