Wood blast gates

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Project by ldl posted 07-20-2012 01:20 PM 17462 views 24 times favorited 7 comments Add to Favorites Watch

I got the idea for this blast gate from Chunkyc. It is a 2 1/2” gate.

This is the first one I built. I used 1/8” hard board and 3/4” plywood. I used 2 1/2” hose coupler for one side and 2” plastic pipe for the other side because I used 2” plastic fittings out of my separator. I cut one approx 1” spacer for each side which fit between the two end plates to form the sides for the sliding gate. I used black electrical tape for a spacer so the gate would slide. I used polyurethane glue to glue fittings to end plates. I put together with screws only encase I had to change the spacing but one wrap of tape was plenty of room and slid smooth and snug.

The only problem with this gate is it is open on the bottom when the gate is open as I didn’t make it solid accross bottom and it would draw air through it while the Shop vac is on. I didn’t want to seal the bottom so it wouldn’t fill with dust.

I went back and redid the backing plate to accept a gate that was solid at top for no air and also drilled with a port for suction. This sealed the bottom hole as the gate hole formed a seal all the way around the bottom slot.

-- Dewayne in Bainbridge, Ga. - - No one can make you mad. Only you decide when you get mad - -

7 comments so far

View PurpLev's profile


8652 posts in 4734 days

#1 posted 07-20-2012 01:29 PM


to handle the opening on the bottom, you could redo the hardboard insert – make it twice as long, and drill a large hole on the lower half of it so that when you pull it up, the hole in the insert lines up with the gate hole, but the insert is still IN the gate keeping the rest of it enclosed and sealed (also eliminating the possibility of sawdust to get in there)

-- ㊍ When in doubt - There is no doubt - Go the safer route.

View Marlys's profile


23 posts in 3246 days

#2 posted 07-20-2012 01:34 PM

Based on your construction, your could take some hardboard (same material as sliding part of gate) and cut to fit bottom of gate. Just screw it onto bottom to seal opening. If it gets clogged, just unscrew, clean, reattach. Wouldn’t interfere with function of gate or stick out other side like other designs.

-- The difference between genius and stupidity is that genius has its limits. ~ Albert Einstein.

View Enoelf's profile


192 posts in 3349 days

#3 posted 07-20-2012 01:46 PM

Another thought would be to install the gate so that opening it moves the baffle down. The dust wouldn’t have anywhere to go, but down and into the ducting.
Thanks for sharing.
Well done.

-- Central Ohio, Still got 9 and 15/16 fingers!

View ldl's profile


1135 posts in 3451 days

#4 posted 07-20-2012 01:54 PM

As posted above I redid the backing plate and gate itself to seal bottom slot.

I made the backing plate longer to support the longer gate

I made a longer gate so the hole would seal the bottom slot in gate assy.

I then realized I had no support to the top when the gate was up in the open position. I added a top support section to top of backing plate. I drilled a 1/4” hole in backing plate and gate top for a short 1/4” dowel to hold open when in the raised position. I simply slide the dowel in to hold gate and out to release it. You can’t see very well in pic.

The next one I make I will make the backing plate long enough to support gate in both positions so as not have such a bulky gate. Might even try thinner plywood. These gates are a little bulky but cheap.

-- Dewayne in Bainbridge, Ga. - - No one can make you mad. Only you decide when you get mad - -

View ldl's profile


1135 posts in 3451 days

#5 posted 07-20-2012 02:00 PM

I was going to put this fix under the original post but you guys beat me to the punch.

Thanks for the other ideas and I will refer here when I build the next ones. I actually built two gates for the first gate assy. one for open and one for closed but I would have to replace each one when I wanted it open or closed and figured the other gate would be more trouble than worth keeping up with.

-- Dewayne in Bainbridge, Ga. - - No one can make you mad. Only you decide when you get mad - -

View steliart's profile


2895 posts in 3774 days

#6 posted 06-24-2013 02:53 PM

Your gate looks great and if it works fine don’t bother with the looks :)

-- Stelios L.A. Stavrinides: - I am not so rich to buy cheap tools, but... necessity is the mother of inventions !!!

View ldl's profile


1135 posts in 3451 days

#7 posted 06-25-2013 12:54 AM

Steliart I agree on the looks. There were prototypes and when I build others I have some new ideas.

-- Dewayne in Bainbridge, Ga. - - No one can make you mad. Only you decide when you get mad - -

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