You must ensure that you are working in a very well-ventilated area. You should always kit yourself out with appropriate safety equipment. These include things like safety didymium goggles, thick heatproof leather gloves, and a long welder’s apron made from leather.   Take care to choose appropriate glasses for the fuel and materials that you are working with. Didymium glasses tend to be the best for glass blowing. They will protect the eyes brilliantly against glass fragments, sodium flares, ultraviolet light, and infrared light. If you hear a bang, this could be caused by the fuels mixing and igniting prematurely. Close all valves and call the manufacturer for advice. Ensure all screws on the torch are tightly screwed in. This will keep it from falling over and accidentally causing a fire. You should always ensure that the compression cap on the torch has been tightened. If you allow valves to stay open, this can cause fuel to leak, which can be very costly.  If you are still running into problems, I suggest turning off the flame. Once you have done this, check the nozzle, fuel adjustment levers, and regulators. If the levers are loose, please contact the manufacturer.