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Step 5Diverter and Grate
Now we just need a diverter and a grate to get the air into the combustion chamber.
The diverter should be made from some of the left over duct sheet metal. trace the outline of the can, then add about a 3/4in flap to one side. Cut this shape out, and bend out the flap. It will have to be adijusted till it just fits in the can. Just cut off a little at a time with your snips till it just slides down into the bottom of the can.
Then bend the first 2 inches or so opposite the flap, the purpose of this piece is to ramp the air into the furnace, so it should look like a ramp.
Next we need a grate.
Take the second salvaged can, and a phillips head screwdriver, and you hammer. Place the screwdriver on the bottom of the second can and hit it with the hammer till it pops through...
Continue until the bottom is riddled with a nearly even distribution of holes.
Now cut out the bottom out with a can opener.
The diverter should be made from some of the left over duct sheet metal. trace the outline of the can, then add about a 3/4in flap to one side. Cut this shape out, and bend out the flap. It will have to be adijusted till it just fits in the can. Just cut off a little at a time with your snips till it just slides down into the bottom of the can.
Then bend the first 2 inches or so opposite the flap, the purpose of this piece is to ramp the air into the furnace, so it should look like a ramp.
Next we need a grate.
Take the second salvaged can, and a phillips head screwdriver, and you hammer. Place the screwdriver on the bottom of the second can and hit it with the hammer till it pops through...
Continue until the bottom is riddled with a nearly even distribution of holes.
Now cut out the bottom out with a can opener.
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