Jim- I began to reply to your earlier post but lost it to the electronic winds.

Which is a good slide into my answer to your outside brazing question. Any wind/breeze control is good. A big fence close to where you're working is better then nothing. But the wind does shift and flow around things so having more then one side protected is best. Watching your flame curl away from the joint as well as the frame cool off in the breeze is not good. I also started to plug the tubes (loosely to allow for gas expansion) to reduce the chimney effect that happens when brazing. With the cold air the cooling effect is greater. An aspect not mentioned much is the lighting. Depending of the sunshine and your set up the brightness factor can be challenging. My event tent (white nylon) with the three sides produced a lighting that made discerning the metal's color changes hard. I had to get back to the basic of watching the flux fot temp guide lines. I never found any gas line pressure issues or regulator problems down to the mid 20s i worked in. Andy.