The Harvia steel chimney extension WHP500 is made of stainless steel and enables you to easily extend your Harvia steel chimney. Thanks to an ingenious joint mechanism, the supplementary parts are wound together and the smoke pipes are locked in place by the grooves on them. This prevents movement caused by temperature changes. Indoors, the chimney can be installed up to a height of 3 meters without support. Outdoors, the corresponding self-supported installation height is 2 meters.