A good thing to do whenever building a gun burner is run the mixing tube around a 90* bend after introducing the gas. This does several things:
First, it really aids in mixing the air and gas. Propane and air do not mix well without some extra turbulence.
Second, it reduces (not eliminates) the chances of a backfire. Flame fronts don't like going around corners, they will but they don't like it.
Third, it lets you put the blower and gas jet where convection won't heat it up when you shut it down.
Fourth, It allows a more compact design by letting you put the blower in the stand under the forge furnace.
No problem running it around more than one bend as long as you don't get too carried away. Each bend will require more pressure from the blower to overcome the backpressure but one or two won't effect it much.
Frosty
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