Thanks Len - that's helpful. Since we're on the topic of dryer heat sources what about using this coil? it seems like a reasonable substitute for heat gun heating element while offering more surface area than my initial item question.
I should be done within the next week (hopefully) with the propane gas adaptation of my former 5 lb. fluid bed electric coffee roaster. It uses the dryer ignitor elements and 2 single nozzle propane jets. I hope to put up a video of it all ... maybe you can glean some info from it for your own project.
"If this is coffee, please bring me some tea but if this is tea, please bring me some coffee." ~Abraham Lincoln