How to Make a small Gas Furnace

Step 2 Make a hole in the Can

The can needs a hole, through which goes a pipe, into which is inserted the blowtorch. This is a bit like the blast pipe for the coal forge, but instead of blowing air through to fuel a fire, this is where the heat comes from. a chisel and some pliers are all you really need, the hole doesn't have to be precise, just big enough to fit a bit of pipe in. (don't use glavanised steel) Once you've made the hole, cut a length of tube or pipe about 2 inches long. Under no circumstances should the tube obstruct the torch's air holes. If this happens, the fuel mixture will burn too rich and you'll get crabon monoxide poisoning instead of heat. The effects of carbon monoxide are cumulative, each does gets piled on top of the last. The pipe should protrude about half an inch into the can, offset from the top by about 30 degrees. The picture should hepl you determine what it needs to look like.