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4'' Metal Blast Gates

Attaches to both wall and gate.
Item #
20864
Rating:
86% of 100

Heavy-duty construction is longer lasting and less likely to jam than plastic blast gates. Designed to fit inside the 4" clear flexible hose. For more simple, convenient, and stable operation, use our blast gate wall bracket (sold separately). It attaches to both the wall and gate, eliminating the sloppy hose movement that occurs when opening an unanchored blast gate.

(1) 4'' Metal Blast Gate
More Information
Weight 1.0000
Tech Spec
  • OD: 4''
Size 4"
Material Metal
Type Blast Gate
4.3 / 5.0
90 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
50
25
8
5
2
These work great.
August 1, 2019
Purchased
4 months ago
Woodworking Experience:
Intermediate
4" aluminum blast gates
I had purchased plastic blast gates in the past but wanted something more substantial. I hook one of the two I purchased up to my planer and it worked well. I plan to purchase more.
July 9, 2019
Purchased
5 months ago
Woodworking Experience:
Intermediate
I have one of these on each port on the 4" dust collector main line around the shop. They work very well.
July 4, 2019
Purchased
over 4 years ago
Woodworking Experience:
Intermediate
works like promised
May 24, 2019
Purchased
6 months ago
Woodworking Experience:
Beginner
Works
I bought these to replace my plastic blast gates as they break (which they do, a lot). Much more sturdy
April 29, 2019
Purchased
1 year ago
Woodworking Experience:
Intermediate
Much better than plastic
Closes completely compared to some of the plastic ones that remain partially open.
March 12, 2019
Purchased
9 months ago
Woodworking Experience:
Intermediate
Rugged and reliable. They do the job.
February 18, 2019
Purchased
9 months ago
Woodworking Experience:
Intermediate
The metal gate is stronger than the plastic
I like these gates better because they don’t pull apart
December 18, 2018
Purchased
11 months ago
Woodworking Experience:
Advanced
Blast gates
They work great much better than my previous plastic ones that kept popping apart.
July 19, 2018
Purchased
1 year ago
Woodworking Experience:
Advanced
Overdue
I should have bought these a long time ago. They work excellent and allow dust to be 'pushed' out of the gap on the bottom of where the gate seats. This was my reason for converting from the plastic to metal. The plastic one's track kept getting clogged with dust prevent a complete closure. The metal ones prevent this and work great.
May 14, 2018
Purchased
1 year ago
Woodworking Experience:
Intermediate
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Browse 5 questions Browse 5 questions and 57 answers
Why did you choose this?
Rockler Store
Read better reviews over the plastic variant
Jason L on Nov 11, 2019
plastic breaks
R O on Sep 2, 2019
Read better reviews over the plastic variant
Jason L on Nov 11, 2019
there better than the plastic ones
Carla N on Sep 16, 2019
plastic breaks
R O on Sep 2, 2019
The plastic ones don’t have a lock on them, I am constantly fighting to keep them open.
stanley s on Jul 31, 2019
Tired of plastic gates moving and breaking, these should secure the new aluminum blast gates more cleanly and effectively.
Mike F on Jul 27, 2019
plastic set I have keeps breaking
Gary L on Jul 11, 2019
I have some blast gates that a bought locally, they bend very easy. Wanted a more rigid product.
Thomas D on Apr 16, 2019
trouble with plastic blast gates, metal has to be better
Harvey L on Mar 26, 2019
We ordered 4 a short time ago and require 2 more to finish system. Easy to install and like the durability.
Elaine H on Mar 13, 2019
extending vac system
Brenda K on Feb 24, 2019
This seems like it will last longer than the plastic ones.
Brandon W on Feb 21, 2019
Non clogging without an extension on backside of slide.
Elton S on Feb 17, 2019
they work
Greg M on Feb 9, 2019
Purchased to replace current plastic gates that tend to build up sawdust behind the slide gate inhibiting full closure and leakage of the gate.
Randall S on Feb 4, 2019
like metal better then plastic
sylvan fisher Y on Feb 4, 2019
Picked these over the plastic version for the quality and longevity.
Ron C on Jan 20, 2019
This is the first time I shop with Rockler, I selected this blast gate because it is the item I need.
Jesus R on Jan 18, 2019
Bought one before and liked it
Rodney S on Jan 11, 2019
Better than the plastic which easily clog and break
Michael C on Jan 11, 2019
Used this product before; works very well.
Brian H on Jan 4, 2019
I wanted to upgrade my plastic blast gates with something stronger and self clearing.
Zachary V on Dec 28, 2018
work better than the plastic gates.
tlm on Nov 22, 2018
to close off multiple machines on one line
Jesse B on Nov 16, 2018
a friend has them and said they were of excellent quality.
Richard U on Nov 9, 2018
needed for shop supplies
Keith R on Oct 24, 2018
They work well and I need just one more.
MICHAEL E on Oct 21, 2018
Greatly superior to plastic, which lacks durability.
JAMES P on Oct 15, 2018
I needed it
George B on Jun 29, 2018
I have broken two of four plastic blast gates and after trying to glue them back together, with no success, decided it was time to go with metal, replace the broken ones and add two more machines to the system.
Tug L on Jun 10, 2018
Metal blast gates are reported to last longer than plastic blast gates.
William A D on May 12, 2018
I have used the plastic gates before and found that the have a tendency to break at the seams and in the long run this saves money and replacement time.
John A M on Apr 17, 2018
Previously purchased and worked reliably. Expanding shop.
Jennifer H on Mar 31, 2018
The metal blast gates are more reliable and less hassle in the long run.
Steve C on Mar 2, 2018
Reviews
Denise C on Feb 17, 2018
very durable and rugged, replacing the plastic ones
Neva S on Jan 6, 2018
I like metal blast gates
Gary L on Dec 25, 2017
quality construction
David Y on Sep 28, 2017
Heavier duty. I read the plastic ones won't seal after some use and they break.
Aaron T on Sep 24, 2017
Replacing plastic gates that are failing
BILL B on Sep 12, 2017
Great product, had to get another
Adam W on Sep 5, 2017
Dust collection for new edge sander.
Del B on Sep 3, 2017
Just what I needed.
Paul T on Jul 9, 2017
Setting up central vac system in barn
Scott W on Jul 8, 2017
Because the plastic ones I bought earlier all broke
Jim C on Jul 2, 2017
you sold me worthless 4 inch plastic blast gates that you might sell to your enemies not your favored customers. I truly deserve a full refund for the plastic gates. They leak, they break at the drop of a hat, and they rattle
Jay C on May 11, 2017
Never enough
scott k on Apr 30, 2017
More durability than the plastic gates with which I have experienced clogging issues.
Gregory H on Apr 23, 2017
Two collection lines and need to control one. Like aluminum better than plastic
David G on Apr 12, 2017
Blast gate isolates a section of my dust collection off.
James B on Mar 21, 2017
connect to existing dust control system
Chuck on Mar 11, 2017
there better than the plastic ones
Carla N on Sep 16, 2019
The plastic ones don’t have a lock on them, I am constantly fighting to keep them open.
stanley s on Jul 31, 2019
Will these metal gates work with then wall 4" PVC pipe.?
Arlon M on May 19, 2018
I can't tell from the pictures: Are there mounting holes that allow mounting these flat on panel instead of a flange? I've got an Incra Router Table Combo (the works!) on the way and I'm running my dust collection for the fence through the dust collection cavity which will contain the router. 4" connection to my DC system, 2-1/2" hose from this cavity to the 2nd collection point on my fence. When router head is away from the fence, I'd like to be able to shut down the fence DC.

Alternatively, what type of metal is it? Easily weldable (So I can mount a couple of strips for mounting flat)?
Steven D on May 13, 2017
4'' Metal Blast Gates
4'' Metal Blast Gates
2-1/2'' Metal Blast Gate
2-1/2'' Metal Blast Gate
BEST ANSWER: There are flanges on both sides of the gates and are designed to be mounted in-line to hard or flex tubing.

They are made of aluminum except for the part that slides which is steel. There are no screw holes but they can be drilled for hard tubing and clamps can be used with flex tubing.
Has anyone tried these with 4" 30 ga galvanized HVAC duct? Will they connect?
Tysom on Dec 6, 2015
BEST ANSWER: Solving the same problem now. They fit inside the non-crimped end of the 4" HVAC duct, but there are no screw holes, so I'm in a bit of a pickle since I wanted to use them on vertical sections of duct. Should be fine for horizontal runs.
What's the ID and OD of these?
DaveR on Sep 5, 2017
BEST ANSWER: ID doesn't" matter in this case, there would be no way to keep it attached to the gate. OD, again doesn't matter, it will only fit a 4" hose. I found the flanges tobe some what narrow, so a spring type clamp seems to work best rather than the screw type. I also prefer these gates above the plastic ones because they can be used in any position & do not seem to get clogged as much. Hope this helps.
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Prop 65 WarningWARNING: Drilling, sawing, sanding or machining wood products can expose you to wood dust, a substance known to the State of California to cause cancer. Avoid inhaling wood dust or use a dust mask or other safeguards for personal protection. For more information go to www.P65Warnings.ca.gov/wood.