A blown-air brazing hearth weve used it in the workshop here the last
five years,mainly with a separate propane torch (rarely having need for the
mighty amount of heat a blown propane flame gives you). Single phase, theres
a big blower in the back with gas and air levers on the front. From memory the
torch leaks from one of its joints, other than that the thing is pretty sound,
if somewhat grotty looking.