| 摘要 |
<p>Combustion air duct system for supplying combustion air into the combustion space of a fireplace, said combustion air duct system comprising an air inlet (1), a heat exchanger (2) for heating the air flowing from the air inlet through the combustion air duct system, and an outlet (3) for passing the heated air into the combustion space (4) . The heat exchanger (2) is in direct heat transfer contact with the flue gas flow after combustion. <IMAGE></p> |
