On Thu, 27 Nov 2003 16:54:47 +0000, Peter Parry
wrote:

On Thu, 27 Nov 2003 15:20:24 -0000, "Christian McArdle"
wrote:


I didn't specify whose death. It could your family that you kill, rather
than yourself.

AFAIK all condensing boilers are room sealed (balanced flue) so
blocking the flue would pose no significant risk even if it caused
the burner to produce significant CO output. Extending such a flue
is impractical is it not?


Not necessarily. It really depends on the individual product so one
would have to refer to the manufacturer.

There are some where the flue system is/can be implemented using 50mm
high temperature plastic waste pipe which can be run to 20m if you
want.

Some are concentric and can do the same thing - for example in Germany
in multiple occupancy buildings it is common to have a boiler per
apartment and to run the concentric flue vertically to the roof from
each.

Mine has a choice of either, and I have a concentric system with 125mm
outer and 80mm inner. If I wanted to I could extend just the
outlet from where it comes out of the wall to take it to a more
appropriate position for discharge. It is a moot point because
there is very little plume anyway.

I am sure that a lot of the flexibility comes from having the boiler
fan assisted.

In most instruction books that I have read where long flues are
possible, it does make the point that horizontal runs should slope a
little towards the boiler so that any water deposited in the flue
returns to the boiler. This could make very long runs inside a bit
tricky.




..andy

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