Combustion apparatus flue gas discharge, in particular system of flue gas pipes for a roof lead-through with internal pipe and flue gas pipe made of aluminium alloy

摘要

The piping system for removal of exhaust gases from combustion installations through various roof openings comprises aluminum alloy inner and exhaust pipes (10, 20) whose inner walls (11, 21) are provided with protective layers (12, 22). These layers are resistant to combustion and condensation products in the piping system and prevent formation of aluminum oxide.