Jet DC650 Duct Run Length

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Forum topic by ZiggyZ posted 01-07-2012 02:59 PM 1180 views 0 times favorited 2 replies Add to Favorites Watch
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65 posts in 2582 days

01-07-2012 02:59 PM

I have a Jet DC rated at 600 or so CFM and was wondering if anyone has a comparable unit with some longer duct runs? I was going to see if I could place a Y-fitting near the unit and split two 4” runs, one about 12 ft. with 3 Y’s for machines and a separate line running 6 ft. up the ceiling of my shop, over 8ft. then down 8ft. to my table saw. Every Y- fitting would have a blast gate. I am just trying to avoid moving it machine to machine. Think it’ll work?

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View pmayer's profile


1032 posts in 3263 days

#1 posted 01-07-2012 04:56 PM

With that DC I believe you would be doing yourself a disservice to hook it up that way. I had a Jet rated at 1100 and even that was slightly underpowered for a setup very similar to what you are describing. A 12 foot run is ok, but running it up to the ceiling is a bad idea. You will probably be delivering about 200-300 CFM at the tool which won’t be enough to remove the fine dust that you care about, and will have a hard time pulling the larger debris up the vertical run in a sustained way, particularly when the filter or bag loads up. I would suggest either upgrading to a 2+ HP unit or moving the DC to each tool.

-- PaulMayer,

View Sawkerf's profile


1730 posts in 3266 days

#2 posted 01-07-2012 04:57 PM

It might work, but it will probably be marginal at best. That DC is rated at 650 cfm (I used to have one), but that is measured across the impeller – i.e. no ducting. As you add inlet ducting, fittings, etc, you get reductions in the flow, and the longer the run, the more loss you get.

Smooth wall ducting (PVC, ABS, heat duct) will work much better than flex hose, and minimizing the overall system length, number of fittings, and direction changes really helps, too. Taping all joints, seams, etc also makes a big difference.

-- Adversity doesn't build reveals it.

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