I have my outside temp gauge at the top of the base stack and I got it up to 400-500 and it wasn't even burning at full force. that was for about 45 minutes after I cured my cement!!

I insulated the doors and I can still touch them after the 45 minute burn(I know the longer it cooks the hotter they will get)!! . the 1 inch ceramic blanket worked great!! I used 1- 1/4 #10 -24 machine screws with the biggest fender washers I could find. tapped it right into the door along the webbing. 4 screws per door took me about 30 minutes to do both doors easy!!!!