dust collector piping

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Forum topic by pauljuilleret posted 09-02-2014 09:32 AM 1229 views 0 times favorited 6 replies Add to Favorites Watch
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107 posts in 2166 days

09-02-2014 09:32 AM

Last week I had the Harbor Freight 2 hp dust collector follow me home. Sense then I have been pondering on what size ducting I should run for this machine. I’m leaning toward 5” I will be ordering the Winn nano filter for it today. so far it’s still in the box as I want to have all the needed items rounded up first. I”m also thinking of either the Super Dust deputy or a top hat ahead of the dust collector I want to try to do this only one time not by having to try something only to have to re do it as it didn’t work properly. Any input would be welcome.

6 replies so far

View BTimmons's profile


2303 posts in 2998 days

#1 posted 09-02-2014 06:02 PM

I’m no expert on DC stuff, but I seem to remember most folks use 4” pipe on that unit. Apparently it takes a more powerful machine that pulls more CFM to move the extra volume of air that a 5” pipe would contain.

Anyone please correct me if I’m wrong.

-- Brian Timmons -

View ChrisK's profile


2037 posts in 3595 days

#2 posted 09-02-2014 06:23 PM

4” will help keep the air velocity up. That is what carries the dust to the collector. If the air velocity drops to low, the dust will fall out of the air stream. I am sure there are online calculators for hose dia, length, cfm, hp.

-- Chris K

View derosa's profile


1597 posts in 3349 days

#3 posted 09-02-2014 06:28 PM

Only real issue I recall with 5” is finding affordable pipe, it shouldn’t have too much trouble with that size and is the size of the opening for the blower. The filter will reduce a restriction and help it to flow the 5” better. Biggest issue will be how far you’re running the pipes.

-- A posse ad esse

View buildingmonkey's profile


242 posts in 2061 days

#4 posted 09-03-2014 02:44 AM

You can use S&D drain pipe, it is available in 4” almost everywhere, and in 6” some places. It is the least expensive of the plastic pipes you can buy, and they have fittings that match. It has a bell on the end so you can use it without couplings. Strong enough for dust collection, you really don’t need schedule 40 or sdr 35. The S&D costs a LOT less. If you don’t find it at the first home center, check with another. Menards stocks the 4”.

-- Jim from Kansas

View pauljuilleret's profile


107 posts in 2166 days

#5 posted 09-04-2014 09:54 AM

Thanks for your input on this I’m debating on if I should park it in one area and duct it to my equipment or I found where kdc68 had built his harbor freight along with some other modifications on a movable cart. his idea looked so good to me that I am now leaning towards that route also. My Winn Nano filter should be here the first of the week then I can figure out for sure it’s good to know that on this site, if someone has a question many answers will follow once you ask.

View TheWoodenOyster's profile


1329 posts in 2448 days

#6 posted 09-04-2014 12:17 PM

Keep in mind that if you put a cyclone or top hat in your system, you are going to lose some static pressure. That said, you might want to consider keeping your runs pretty short. I bought that DC planning to hot rod it up with a wynn filter and a top hat. I ended up just leaving it stock because of numerous comments warning about loss of suction over extended lengths. I decided to use this DC as a temporary solution until I get into my permanent shop where I can set up a whole system. So, If I were you, I would keep the runs short, which may mean rolling the DC around the shop to the machines as you use them. I do this now, and while it takes a couple extra minutes, it’s not too bad. You get way more suction and you won’t have to pay for and install all that piping. 5” piping is going to be way more expensive than 4” options. Either way, a large ducted system with blast gates and such will not be cheap, no matter what you use for ducting. I’d strongly consider rolling it around, at least for a while. If you don’t like it, you can splurge and put in a big ducted system.

-- The Wood Is Your Oyster

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