The inventive Harvia WHP1000 steel chimney extension is designed to prevent movement caused by temperature changes. This chimney extension is made of classic stainless steel and can be installed both indoor and out. Prevents movement caused by temperature changes Can be installed indoors and outdoors Designed, engineered, and made in Finland Dimensions: 8.6" D (220mm) x 39.3" H (1000mm) 1000mm stainless steel chimney extension The following items are required for the successful operation and installation of this product.