In message 47f11057@qaanaaq, Andy Hall writes
On 2008-03-31 16:39:08 +0100, Andy Dingley said:

On 31 Mar, 14:41, Andy Hall wrote:

As you say, to research that properly and to form an opinion would
require a trip to the unversity library and quite a few hours of
research and maths.
You can't afford Encyc. CPD (two dozen volumes, hundred quid each)
and
you won't find a copy of Glor as it's OOP and scarce. Luttgens'
"Electrostatic Hazards" is the only one that's even vaguely
affordable. That's also a bit qualitative, not quantitative, so I
doubt you'd be convinced by it anywayy

Exactly, so cutting it short and taking the pragmatic approach of using
metal duct is the thing to do, for other reasons as well.

Gentlemen!

I shall be using 150mm metal duct for the main overhead run. The spigot
on my fan is 150mm o/d so it will require, at least, some flexible
piping for the final connection.

I have not decided about the actual machinery connections. I don't have
a spindle moulder so the main *dust* generators are the bench saw and
the planer/thicknesser. I have a Wadkin pull over saw and a powered
morticer but foresee problems in gathering the chips.

It would be nice to collect the output from various hand tools as well.
I plan to seek council from my woodworking tenant who has overcome all
these problems:-)

regards




--
Tim Lamb