Sheet metal chimney wall has stiffening grooves or profiles shaped by cold forming process

摘要

A chimney has sheet metal sidewalls that incorporate stiffening profiles produced by a cold forming process. The profiles are grooves or corrugations with a radius of e.g. 20 mm, 50 mm or 100 mm. A typical value for the depth of the groove is 20 mm, 50 mm or 100 mm.