This doorset is a heating unit. It has upper air valves and an air wash for clean efficient wood burning. It has 2 inch full frame doors with 1.5 inch centers. The doors have neoceram glass and they have fiberglass rope door seals and lever action cam handles for maximum airtightness. This unit has heat exchangers and a fan with speed control. The main frame is painted metalic black and the doors are 24K gold.