General International Dust collector

  • Advertise with us
Blog entry by RBWoodworker posted 08-19-2017 08:02 PM 1058 reads 0 times favorited 6 comments Add to Favorites Watch

I recently purchased a used 5 hp General International dust collector that is around 4,000 cfm. It has a 4 port inlet of 4”ports each.
I want to run a 5” pipe, but I don’t think running a 5” pipe, reducing down into 4” at the collector is efficient. Do I need I swap out the inlet flange with a 5” single port? or even a 6”?
I really wanted 2 ports of 5”on the collector because I’d like the ducting I’m running to branch off and go along opposite walls of the shop if that makes sense.

-- Randall Child

6 comments so far

View Redoak49's profile


5091 posts in 2995 days

#1 posted 08-19-2017 09:30 PM

It would be very helpful to provide a model number. I would get the dimensions of the inlet port and see what I could get for a Wye connector to fit.

I think you would get better response posting in the forum as this is really not a blog topic.

View changeoffocus's profile


467 posts in 2624 days

#2 posted 08-20-2017 12:38 AM

I would suggest you try it as is because the velocity that close to the machine should overcome the reduction in pipe size.
When you do the install the piping give yourself some room to change it should it not work.
Good luck on your installation.

View Andre's profile


4279 posts in 2813 days

#3 posted 08-22-2017 05:44 AM

I have the baby brother 2hp with 2 – 4” ports attached to a 6” on the intake. I ran 2 lengths of 4” pvc in opposite directions with a multitude of branches each with a blast gate. Bought an Anemometer to measure CFM and air speed to compare different configurations, Also put inline a Veritas cyclone lid on a garbage can to collect shavings from the Planer/jointer and tablesaw. ( Had to install baffle rings in plastic garbage can as the machine sucked that sucker in like a pop can getting crushed ) Was very surprised my how little suction and CFM’s were lost, actually increased from running flex hose to the machines. I typical only run with one 4” leg open at a time, except on my band saw which I have a 4” to the cabinet and a 2.5 below the table by the blade. I suspect you will be able to run with 2 or 3 -4” ports open and probably need too to prevent loading down the machine. You could adapt your 2 – 4” into a single 5” or 6” with no problems?
On a side note, the starter on my motor burnt out after about a year and replacement took about 3 months, not a standard size had to be special order, ended up replacing bearing in the motor at the same time so cost was almost the same as buying a new motor.

-- Lifting one end of the plank.

View RBWoodworker's profile


442 posts in 4359 days

#4 posted 08-22-2017 01:46 PM

The Machine is the 10-510
This is the first time i’ve ever had to pipe in for a dust collector for multiple machines. I’ve always just rolled my smaller single bag 2 hp over to the machine and hooked it up,which is time consuming and a hassle.
I considered having the bearings replaced on the motor as well, for the motors are almost $900.
the collector came with the 5” piping, so I was hoping to use that, but the 4” PVC sounds tempting and easier to use.

And yes..I probably should have posted in the forum, but I haven’t been on this site in years (too busy )

-- Randall Child

View pintodeluxe's profile (online now)


6315 posts in 3820 days

#5 posted 08-24-2017 02:51 AM

Go with 6” piping as a bare minimum for that machine. I use 6” metal ductwork on my 2 hp Tempest and it works well. The main branches go down to 5” and 4” pipe near the machine.

As far as the main trunk line, match the diameter of the inlet. Usually it is 6-8” diameter.

-- Willie, Washington "If You Choose Not To Decide, You Still Have Made a Choice" - Rush

View RBWoodworker's profile


442 posts in 4359 days

#6 posted 08-24-2017 12:46 PM

The main in let is a 4 port 4” inlet..would I need a flange for the 12” opening on the impeller housing?

-- Randall Child

Have your say...

You must be signed in to post the comments.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics