low and behold, as I reread Lanaset instructions again, I was troubled, to say the least, that I was reading the C. temps. as F. temps. So I never was getting my fiber up to the higher temp. range. I think this would explain why the exhaust is not complete, and the fiber is 5G instead of 5GY. Back to the drawing board. I am sooooo glad I discovered this now:p