I'm new to all this as well and trying to design an oven for curing using an IR propane heater.
I used the calculator here to determine the BTU needed for the size of my oven:
http://www.heatershop.com/btu_calculator.htm
I bought my IR heater here:
http://www.northerntool.com/webapp/w...2707_200332707
And I'm looking at this insulation here (1") (9356K11):
http://www.mcmaster.com/
If someone out there thinks I'm totally lost, please let me know!