"leonard" wrote in message
...
thanks guys,
I have read the grounding post before.And have consulted my wife the (PHD
in electrical engineering) also about the grounding and she say not to.
What I'm trying to pick is the material to use as ducting, pcv, havc or
special made spiral duct, ect. I have Six machines to hook up and a floor
sweep with 1 1/2 hp dc(with a chip collector).

Len


The problem with steel ducting is the cost of the fittings. They are a
friggen rip-off and one 'Y' connector can add up to the total cost of a
complete 4" PVC system. PVC works fine, is easy to use, strong, and is very
cost effective.

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