| 摘要 |
<p>A firebox for a furnace comprising a casing having a combustion chamber with an opening for charging fuel; first inlet means from the combustion chamber for a flue passage, said first inlet means being adjacent the top of the combustion chamber; second inlet means from the combustion chamber for a flue passage, said second inlet means being disposed lower than said first inlet means; and supply passage means for combustion air to said combustion chamber having an entry opening to said combustion chamber that is higher than said second inlet means for said flue passage.</p> |
