Reply by jmos

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Posted on Dust collection strategy

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917 posts in 2976 days

#1 posted 05-09-2012 05:43 PM

Welcome to a confusing world; lots of info and ideas. If you want to read up I’d suggest Bill Pentz;s site. He has a lot of information there.

1 – Well, they kind of have to only have one inlet, right? Many, like my PM-1300 has an adapter installed taking the 6” to two 4”, but can be removed. If you’re running duct you should go with the one big inlet.

2 – PVC or metal is usually the question. Both can work fine. I suppose ABS can work too, but I think it would be pricey for an entire system. I’d make the call based on price and what’s easily available to you. Pentz recommends PVC sewer and drain pipe, thin walled and cheaper than schedule 40 stuff. Also seems to think heavy (26 gauge) home center HVAC duct is OK, just avoid the thin 30 gauge stuff.

3 – As long as you have a way of shutting off the drops that are not in use, you won’t have a problem (blast gates are the usual method.) You can NOT plan on leaving all the machines open to suction all the time and expect to get suction without a pro-shop size system.

4 – In general you want to run as large a pipe as you can for as long as possible, and keep the flex hose to a minimum. Both flex hose (rough interior) and small diameter pipe cause high pressure drop. As a general rule you’re not going to get great suction from a DC through a 2.5” pipe, it’s too small and the DC doesn’t have suction that high. Might be better off with a decent shop vac for 2.5” ports. Better yet, try to increase port sizes to 4” (even converting 4” to 6” is good) which will allow the DC to move enough air to get good collection.

Lots of threads about this, do some searching on-site.

-- John

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