Got some additional information from Jeff at CK. The air cooled 130 FL torch (p/n CK-FL1325NSF) comes with the 2 series head which makes it 130A, but you can change the head to the 3 series (p/n CK-FL3L) and you have a 150A torch. All CK torches are 100% duty cycle. I think this is pretty cool option and makes me like this torch even more.