Glass artist Michael Andrews is appropriately dressed in a flame shirt as he shouts above the din of the home-made furnace, which casts an orange-red glow around his shop and hisses like a giant blowtorch.

"This furnace runs just on propane," he says. As he talks, a truck driver outside unloads from a flatbed dozens of tall oxygen tanks and a few fat propane tanks, propping them like mini-submarines near the shop wall.