| 摘要 |
This invention is directed to extruded structural members snapped together to form a metallic chimney for surrounding a ceramic tile lining. The metallic chimney comprises two pairs of extruded members wherein each pair is identical in configuration. Each member has an inturned flange at one side extending along its full length which is turned back on itself to form an open ended slot extending outwardly of the member. A protuberance is arranged within the slot for engaging with a catch. The opposite side of each member is provided with a catch for engaging with the protuberance of an adjacent member. The members are alternately positioned to form a column with the catch at one side of each member engaging with the protuberance in the slot of the side of an adjacent member.
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