The ventilation tubes receive the air from the bottom of the heater, it rises upwards as it gets heated and exits between the top stones. All parts of the heater in contact with flames are made of 5mm sheet steel.The bottom of the sauna heater is made of 3mm sheet steel. Ash box is made of 2 mm sheet steel. The hand crafted ash grate is made of 10×20 mm square steel.
Safety distance to sides and back / wood and bricks (mm) 500. Safety distance to front (mm) 1000.Safety distance from upper surface to ceiling min. Location of smoke outlets on top: from rear edge to centre of hole (mm) 169. Diameter of smoke outlet (mm) 115. Maximum length of firewood, (mm) 300.
If you have any technical questions, feel free to ask, we will reply within 24 hours except for weekends. This item is in the category "Home & Garden\Yard, Garden & Outdoor Living\Pools & Spas\Sauna Heaters".The seller is "saunawealth" and is located in this country: EE. This item can be shipped worldwide.