Quote Originally Posted by xNoa
...some huge furnaces aswell with insane temperatures you could easily feel a good 10 meters back
Yeah... now days they do it with torches mostly and use a smaller oven so the peice doesn't crack as it cools. At least for pipes and stuff like that. I am sure the blowers who make huge glass sculptures, bowls and vases and whatnot still use furnaces but I have never seen a setup like that.