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What is this extension for?

It extends an existing Harvia steel chimney by 1000 mm, so you can reach the required height above the roof.

How does it attach?

The parts wind together and the smoke pipes lock in place by the grooves on them, which prevents movement caused by temperature changes.

How high can the chimney go without support?

Indoors up to 9 ft 8 in (3 m) without support, outdoors 6 ft 6 in (2 m).