Blast Gates for 4" PVC

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Project by JSB posted 08-10-2014 05:57 PM 3313 views 22 times favorited 8 comments Add to Favorites Watch

I’ve been using this style blast gate for 4” PVC dust collection pipe for a couple years now and it works great. They are easy and very inexpensive to make. I just made another pair and recorded the process. To make a pair of blast gates you need:

one 4” PVC coupling
a piece of pipe at least as long as the coupling
six 6”x6” plywood squares. Any thickness will do.
a scrap block for the handles
and some construction adhesive.

Here’s a short video covering the build process:

Also, I made a SketchUp video covering the design process:

-- Jay -

8 comments so far

View mariva57's profile


666 posts in 2852 days

#1 posted 08-10-2014 07:35 PM

Seem a good idea and a great saving of money, compliments.

-- The common man thinks. The wise man is silent. The stupid man discusses.

View Roger's profile


21030 posts in 3651 days

#2 posted 08-11-2014 12:14 AM

You’re a gr8 fabricator, Jay. Good stuff.

-- Roger from KY. Work/Play/Travel Safe. Keep your dust collector fed. [email protected]

View tyvekboy's profile


2045 posts in 3860 days

#3 posted 08-11-2014 03:08 AM

Thanks for taking the time to share a great idea.

-- Tyvekboy -- Marietta, GA ………….. one can never be too organized

View RyRat's profile


27 posts in 2363 days

#4 posted 08-11-2014 04:21 AM

Nice shop made blast gates!

Have you had any issues with the PVC being that close to the outlet? I had a spark jump once while using a shop vac near an outlet. Scared the crud out of me and I think it tripped the breaker. Maybe something to look out for?

-- If you are flammable and have legs, you are never blocking a fire exit. -Mitch Hedberg

View JSB's profile


737 posts in 2925 days

#5 posted 08-11-2014 04:44 AM

RyRat – I’ve never seen or heard of that happening.

-- Jay -

View TheFridge's profile


10861 posts in 2333 days

#6 posted 08-11-2014 04:52 AM

It’s possible with static build up but harmless. Not unless it was afci or gfci breaker it wouldn’t trip. Prob not even then.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

View Monte Pittman's profile

Monte Pittman

30566 posts in 3185 days

#7 posted 08-11-2014 03:36 PM

Very well done sir.

-- Nature created it, I just assemble it.

View Grumpymike's profile


2466 posts in 3162 days

#8 posted 08-11-2014 05:30 PM

I have about 80 feet of 4” PVC pipe for my dust collection system. I run it nearly every day for short periods of time (while the saw or other tool is running) and I have never encountered a spark or arc of any kind.
The static will cause the piping to get a bit of dust stuck to it, but no arcs … yet … I have run a grounded wire to test it to see if I could raise an arc, but no.
I think if we were in a flour mill or a gas plant there would be more concern.

RyRat You may want to check the grounding on your shop-vac and check the polarity at the plug and the outlet, sounds like something is reversed???

I have been buying the ABS plastic blast gates from the woodworker supply stores, and after about two months they will only close about half way … now I have to take them out of the line, go to the bandsaw, cut off the back end and create a relief port for the sawdust to be pushed out … what a pain.
It looks like JSB’s are open on the back side? Or do you have to clean them out every now and then?

-- Grumpy old guy, and lookin' good Doin' it. ... Surprise Az.

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