Reply by BobAnderton

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Posted on Ducting for Super Dust Deputy ---do I need 5" ducting?

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283 posts in 2962 days

#1 posted 05-27-2018 07:34 PM

I would definitely run 6” duct, even if it restricts down to 5” going into the dust deputy. You are going to lose X inches of static pressure pulling air through your ducting, and you want to minimize how much that is, which means larger ID duct is better, as long as you’re maintaining sufficient airspeed to keep things moving.

You are going to lose a lot of static pressure due to the cyclone, and a lot more pulling through your ductwork. I don’t think the restriction of a 5 inch inlet to the cyclone will be that much of a factor. You’ll pull more air through 6” duct network feeding a 5 inch inlet cyclone than you would with 5” duct network feeding a 5” inlet cyclone. Plus the 6” sewer and drain PVC is cheap and standard.

You can model all the what-if scenarios for your setup options using Bill Pentz's excel static loss calculator , but I think the take-away is run 6” up to the cyclone (and 6” tool ports where possible) to minimize the static loss that occurs upstream of the cyclone.

-- Bob Anderton - Austin, TX - Nova 3000 lathe, Alaskan Mark III mill, Husqavarna Saw

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