F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
F23M3/00—Firebridges
F23M3/02—Firebridges modified for circulation of fluids, e.g. air, steam, water
F23M3/04—Firebridges modified for circulation of fluids, e.g. air, steam, water for delivery of gas, e.g. air, steam
F23M3/08—Firebridges modified for circulation of fluids, e.g. air, steam, water for delivery of gas, e.g. air, steam away from fire, e.g. towards smoke outlet