| 摘要 |
<p>PCT No. PCT/NO96/00086 Sec. 371 Date Oct. 17, 1997 Sec. 102(e) Date Oct. 17, 1997 PCT Filed Apr. 15, 1996 PCT Pub. No. WO96/33322 PCT Pub. Date Oct. 24, 1996A thermal insulating or fire retardant construction element (1) is described, consisting of outer layers (5,6) of glass fibre reinforced concrete and a mineral wool layer (4) between the outer layers (5,6). At the back of the panel (1) a cavity (7) is formed to permit circulation of air between the panel (1) and the wall therebehind. A lead-through duct is also described for leading a smoke pipe from a fireplace to a chimney through the element, the external face of the duct communicating with the air space behind the element.</p> |
