Insulated chimney structure

Details Insulated chimney structure Insulated chimney structure

E - Fixed Constructions

04

F

20/103

E04F 17/02 (2006.01) E04H 12/28 (2006.01)

Patent

CA 1174028

ABSTRACT OF THE DISCLOSURE: An insulated chimney structure of the type compris- ing an outer casing, an inner flue spaced from the casing and made of a metal sheet, and a solid heat insulating material therebetween. The metal sheet of the flue has a pair of longitudinal edges and is folded into a closed cy- linder with its edges connected to each other in a non rigid manner to define a continuous, expansible lock joint. Due to this expansible lock joint, the metal sheet flue may freely expand whenever heated, without radially pressing against the insulating material and outer casing whereby to avoid damage to the chimney structure or draft reduction.

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