WIKING Miro 2 Wall Mounted Big Green Egg Cooking Surfaces purely mechanical device supplies the purely mechanical device supplies the precise amount of primary booster air when it's needed to ensure quicker starts and minimal emissions during refuelling as well as at the end of the burn cycle Use XL compatible components when choosing a nest Construction: Cast iron door and fire chamber base with steel bodywork Flue Outlet: Top or Rear (optional blanking plate required when using rear flue) Flue Diameter 150mm 6" Grate Type Flat bed with open close centre grate and ash pan Guarantee: 5 Years Maximum Log Length 280mm 11" approx Standard Colour Matt black such as at the start of the fire or when refuelling and this all helps to promote quicker fire lighting with the least emissions