Hi John
I have a Reil type burner, using propane gas and a jet size of 1mm dia. The gas has a variable pressure control, and the air intake is varied by a shutter on the venturi. This unit has been excellent for melting aluminium in my furnace. I have aquired a new centrifugal fan used for a combi central heating unit, and would like to build a brazing hearth based on the furnace burner but with air pressure, to give me a more variable and hotter flame. Thanks for your comments.
Cheers David