| 摘要 |
The coupling system is for the connection of a pipe system to a heating boiler, comprising a flue gas output pipe and an air input pipe. The coupling system (1) on its upper side is provided with three connection apertures (18,34,42) the first connecting aperture (18) is used for connecting the coupling system to the flue gas output pipe. The second connecting aperture (34) is used for connecting the coupling system to an air feed pipe of a concentric pipe system, whilst the third connecting aperture (42) connects the coupling system to the air feed pipe of an eccentric pipe system.
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