Uniweld’s 2290-4H oxy/fuel gas (not for use with acetylene) heating tip end is used in pre-heating and straightening. When used with propane this tip can generate 400,000-820,000 BTUs per hour (requires 3/8” hose for maximum flow and BTU output). On continuous duty withdrawal, manifolding of cylinders may be required. To calculate heat output for propylene, use 2400BTU/cu.ft. X Flow CFH.