and during fires, especially forest fires. Such smoke may contain large particles of unburned fuel and ashes, metallic oxides, soot, and tar. If flue gases are poorly cleaned, the immediate environment is polluted, the microclimate deteriorates, fog is formed, and natural illumination is reduced...
The secondary air/flue gas heat exchanger comprises a heat pipe coil (24) installed in the gas outlet chamber (25) and the air inlet duct (26). Condensate is drained from the gas outlet chamber by a drain pipe (21) to a collector (22)....