Their is an interesting Link on the LaymarCrafts Web Site titled "Grounded
PVC and other Dust Collecting Myths" well worth a read before you come to
any conclusions.

Excellent article written by someone who knows about static. He distills
everything into three falsehoods:

1. The number one myth must be that PVC ducts are dangerous. As both theory and
practice show, home shop Dust Collector explosions are somewhere between
extraordinarily rare and nonexistent. The volume of a typical run of 4 inch
duct, say 20 feet, is about 1.7 cubic feet or equal to a cube 14 inches on a
side. I do not know the explosive power of this volume of dust, but I do not
think this is going to level your shop.

2. The number two myth must be that you can ground PVC. You simply can't ground
an insulator. There are things you can do to reduce the odds of a strong
discharge, especially to your body, but they are far from perfect.

3. The number three myth is the unstated corollary to myth #1: the only thing of
concern in a dust collector are the ducts. As seen above, the collected dust
pile and the collection bag are greater hazards than the ducts. Fortunately, in
practice home shop sized dust bags have shown themselves to pose little
explosion hazard.

More at:
http://www.airhand.com/designing.asp
http://en.wikipedia.org/wiki/Dust_collection

http://www.laymar-crafts.co.uk Technical Pages ~ Links ~ Dust

RVS

"Kevin Cleary" wrote in message
news:GxWpg.22280$US2.19808@trndny03...
I've heard that using stove pipe as opposed to PVC works better for
reducing
static electricity.
Does anyone have any thoughts on this.