| 摘要 |
PURPOSE:To prevent concentrated jetting-out of air from a jet-out nozzle and make it possible to provide an ideal diffused jet stream of air to a section above a heat exchange section and an exhaust gas outlet by providing a discharge pipe with a plurality of air jet-out nozzles and providing in front of the nozzle a diffuser so as to make its angle variable. CONSTITUTION:The air which a combustion fan 8 draws from an exhaust gas opening 5 is supplied as the air for combustion to a burner 4, and it is discharged from a discharge opening 6, and part of the air from a fan 8 for combustion is jetted out to a heat exchange section 7 or an exhaust opening 6 from a nozzle 11 through a discharge pipe 10 connected to a branched opening 9 to obtain heat from a heat exchange section 7 or mixed with the exhaust gas from an exhaust gas opening 6 and discharged into a room from a warm air outlet opening 1b. At this time the air from the branched discharge opening 9 jets out energetically by the nozzle 11, and by its ejector effect draws the air in a room which flows in from an air suction opening 1a and supplies the air to the heat exchange section and the discharge opening 6. Furthermore concentration of air by the nozzle 11 is prevented by employing a diffuser 12.
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