Exhaust gas assembly for a heating system, using a liquid or gas fuel, has an inner exhaust pipe within an outer mantle to give ventilation, surrounded by a cuff with foaming material at a wall/ceiling passage to seal it off in a fire

摘要

The exhaust gas chimney for a heating system, using a liquid or gas fuel, has an inner gas channel within an outer mantle for ventilation in a counter flow. The exhaust pipe (10) and the outer mantle (11) are of plastics materials, at least in sections, At least one cuff (13), as a metal housing, is around the outer mantle at the passage (12) through a ceiling (16) or wall, together with a material (14) which foams at high temperatures, and especially an intumescent foam.