losing heat through the doors

[smokinbird89]

I have taken an old Grieve oven and turned it into a potential powder coating oven. The inside dimensions are 68" wide x 66" tall x 33" deep. I have (3) 2800 watt elements. It took an hour and a twenty minutes to get to 373 degrees. I didnt wait any longer and shut it down. I added an extra 4 inches of insulation in the walls and 8 inches floor during the build. Using a heat gun I am losing a lot of heat through the doors. The doors are getting about 250 degrees while the rest of the oven outside only is warm to the touch. The only thing that I can think of doing is building a new single door to go on the oven or add another element to compensate for heat loss. Does anyone have any input on the matter.

[Popeye]

I'd either rebuild the doors, insulate and seal the c r a p out of them...or make a new set.
It looks like it will make a nice oven when you're done.

[ed_denu]

How are you measuring the temperature? Depending on where the thermostat is located and if you do not have a circulating fan then the temperature could vary greatly from one area to another. Try placing a couple of oven type thermostats at various places and observe the readings.

[smokinbird89]

Would not having a circulation fan make that much temp difference? I was going to put one in down the road but if its going to make that much difference I will do that now. Does anyone have a link to a good fan for my application. I dont even have it vented and dont know why it has to be. Any and all info appreciated. I have also attached a few more pics.