You can create vents in your burn barrel with just a few tools and a little bit of work.
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Use a cutting torch to cut three square holes a few inches from the bottom of the metal barrel. These should be evenly spaced around the barrel and about 3-inches square.
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Cut three pieces of metal-mesh slightly larger than the holes you made.
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Drill four smalls holes around each of the venting holes.
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Screw the mesh over the holes to prevent embers from causing a fire.
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Cut a larger piece of mesh to lay over the top of the barrel when it is burning. This makes it easy to add more brush, preserves oxygen flow and prevents embers from flying out the top of the barrel.