Regarding torches, the sonic torch

The Sonic Torch has more smaller branches, unlike the older torches which all have a single barrel with a very intense flame. The sonic torch dynamic seal is located inside the cylinder at the lower part of the central cylinder, while the central plum blossom nozzle is placed at the top of the central cylinder. Several cantilevers extend from the central cylinder, and a single-cylinder burner is installed at the upper end of each cantilever; a flame stabilizer is positioned above each single-cylinder burner. The central plum blossom nozzle is situated close to the constant flame used for ignition. The advantages include high outlet flow rate, excellent smoke-free combustion performance, the ability to handle large volumes of combustion gases, long equipment lifespan, a wide range of adjustment options, low thermal radiation, and good sealing performance.