6 Oct ’15
I was always taught Yes with metal collecting ducts. Kind of like a grain silo...a lot of dust goes boom easy...so, with dust along with potential for spark (from static electricity build up from friction) it's supposed to be good to ground. I am no authority on this though...maybe this is something to test on Myth Busters...but I think all the dust and potential for static build up makes sense.
Thinking of ditching the drain tile and just using pvc, good discussion on it here with conflicting positions.
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