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air circulation ash dump brick building burning ceramic check valve chimney cap chimney flue clay cleaning combustion concrete convection cool corrosion crack degrees Farenheit device downdrafts draft draw efficient energy expansion chamber finished fire fire's heat fireback firebox floor firebox walls firebrick fireclay fireplace builder fireplace construction fireplace design fireplace heat fireplace opening firespace floor level flow flue liners flue pipe flue walls function glass doors grate hearth heat jacket heat recovery heated water heating system height high temperatures hot air hot water inches installed insulated interior jambs lintel located mason masonry facing materials metal firebox metal flue mortar outlet vents owner-builder pipe plumb Portland cement prevent radiant heat rebar refractory refractory cement requires rise room air Rumford sides smoke shelf soot steel stone stove structure surface tank thermal mass thermosiphon throat damper tion valve warm water jacket welded wood fuel woodstove