Fore warned is fore armed so to speak. It isn't by any chance fitted to an
old chimney ? If it is, then is the chimney lined with cope ? Or does the
flue just need swept ?
Lots and lots of questions and no answers yet till you get there. Still, it
can't be that bad. :-))
If its only started to show signs now Dave, after 17 years, then it sounds
like a good system. That's if it is spillage (?)
I once saw a tangled mess of spider webs and muck that had fallen into a
lump inside a horizontal section of duct, the flue hadn't been used for
quite a few months during the summer. Well this lump of muck would have
choked a horse, and when the system was fired back up in the winter time, it
nearly killed everyone in the place with the amount gases it was pumping
back in to the rooms.
When the maintenance guy was asked if he'd checked it out as he should
before he had restarted the system, he said he'd looked along the flue pipe
and thought the lump was some kind of baffle that had been installed to stop
draughts blowing back in. He's learned his lesson now though. :-))
Good luck with it.
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