The Stratasys chamber is sealed. It used one four inch fan to blow air over the back of the extrusion head, 4X4 inch fans to circulate air and one four inch to blow air over the printed material on the SST, the BST doesn't have a fan to blow the print,. The temperature is 70c and is fixed under normal use. It is possible to change it but only by "hacking" the machine and I have never found a need to, 70c is optimum for ABS, I have tried lots of temperatures above and below but 70 performs best.

My Wanhao will print for ever without overheating or skipping steps. I say for ever but the longest print I have done on the Wanhao is around 22 hours.