On 12 Jul 2004 21:50:11 -0700, (Joe Emenaker) wrote:


snip post about how pvc isn't a static explosion hazard, but metal
duct is better anyway.


I recall reading some article about a week ago where the author went
into 4 more-likely fire hazards in your DC system than static
electricity. One of them was hitting a nail (or other metal) which can
cause red-hot sparks to go wafting through your DC system to the
collection bag.

wouldn't metal duct (or more likely the sheet metal screws) present a
lot more opportunities for bits of hard stuff like chips of metal or
pebbles from the shop floor to strike sparks? of course the big one is
still gonna be the impeller blades themselves....