| 摘要 |
PURPOSE:To contrive an improvement of hazard prevention, a heat exchanging efficiency and an air conditioning effect by a method wherein warm air heated by a heat exchanger is caused to be blown out from the lower part of an observation hole. CONSTITUTION:A heat proof and light permeating material 33a such as glass is provided against a burner on a part of a side wall 27a forming a combustion chamber. Furthermore, a warm air duct 29 is formed of the said side wall 27a and a side wall 34, but a heat proof and light permeating material 33b is provided against the said heat proof and light permeating material 33a on a part of the side wall 34. A heat proof and light permeating material 33c is provided on the upper part of a panel 35, with which said heat proof and light permeating materials 35a and 35b are forming an observation hole, too. An air blow outlet 3 is provided on the lower part of the observation hole, which is connected with said warm air duct. The abservation hole, therefore, can not be heated, and a heat exchanging is expediated further with a radiant heat passing through the observation hole. |
