Grainger has a heat gun that is adjustable from 300-500 degrees with an airflow velocity of 3000FPM and a volume of 30CFM. Unfortunatley that does not mean anything to me. That is why I am curious of the airflow velocity and volume of the Sonofresco and Sivetz. Achieving roasting temps really should not be an issue, as you can purchase a heat blower and most seem to be adjustable up to 1650 Fahrenheit. I will put the receiving end of a digital thermostat in the roasting chamber so I can measure the actual air temp within the chamber.
I know that if I use a fan to supplement the airflow velocity and volume from the heat gun that it will be throwing ambient room temperature air into the chamber too, so I will have to have a gun that can adjust up high enough temp wise to outweigh the ambient air.
A PID would be optimal, but unfortunately I have no idea how to rig one of those to a heat gun
.
It is funny you mentioned the fluid bed roaster that uses the leaf blower and the heat gun! There is a video of that on youtube. I just typed in fluid bed coffee roasters and his came up. It seemed to get a nice result too!
Thank you for the continued input!
-Mike