This chimney extension is made of a sleek black powder coated steel and can be installed both indoor and out. The inventive Harvia WHP500M steel chimney extension is designed to prevent movement caused by temperature changes. Prevents movement caused by temperature changes Can be installed indoors and outdoors Designed, engineered, and made in Finland Dimensions: 8.6" D (220mm) x 19.6" H (500mm) The following items are required for the successful operation and installation of this product.