Jay,
A couple of questions:
1. How big is your oven going to be?
2. how often do you plan on using it?
3. How will you be insulating it?
Correct me if I'm wrong but, I believe IR heats objects not air directly. I doubt you will see 400f temps inside your oven, unless you leave a part in there for an extended period of time. It seems to me that a gas IR heater closed in an oven would be a bad choice. The reason I say that is...if you have odly shaped parts you will run into problems getting your powder to cure in the corners. Another consideration is... How will you turn the part during the curing process to keep it flowing out and curing somewhat evenly? I personally like gas IR heaters for curing, but wouldn't recommend putting it in a box. Besides...How will you feed the propane to the heater? That would take some potentially hazardous plumbing, because you might need to have the ability to relocate the lamp inside the oven to enable larger pieces. I'd say for a more permanent setup...I might be tempted to use several(3 or 4) electric IR lamps in a sheet metal box configuration. If you stagger them properly in a horseshoe shape you will probably get pretty good coverage. It's an expensive solution, but it has alot of potential. Just my humble opinion. Good luck with it
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