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(Lysander) wrote in message . com...
Is there a way a non-plumber can do something about the plume? Our
neighbours haven't complained yet, I don't think I'd blame them if
they did but I'd like to pro-active and sort it beforehand. The
exhaust pipe is horizontal and has two larger diameter pipes
surrounding it (cooling fins??) and the whole thing is covered with a
what resembles a deep-fat fryer basket.

I did so with mine, quite easily, using a chunk of scrap
stainless-steel sheet. In my case, the plume also emits horizontally,
from an outlet about the size and shape of a can of beans ['A' in the
ascii art below]. Using a cardboard template first, I just cut and
bent the sheeting into a bracket-like gizmo; this screwed to the wall
next to the outlet, at 'D'. The plume now strikes an angled plate at
'B', and diverts upwards; the angle pre-determined to prevent the
plume going straight up, or damaging the soffits on my garage directly
opposite the outlet.

----------------
/
---- /
| / (side view)
A| B/
---- /
----------/C

---------------|
|D |
---- |
| | (top view)
A| |B
---- |
-----|

Any condensation just runs off the bottom of the gizmo at 'C' and
falls to the ground.

This arrangement deliberately doesn't interfere with the flue itself
or with the actual emission of the plume; I'm sure that to do so would
risk damage or potential danger. But it avoids having to do expensive
remedial work on the flue using approved components (and in any case
there were none suitable for my application).

hth
David