 As a stoker, he was responsible for removing the dead bodies from the gas chambers, breaking out gold teeth, and burning the bodies, as well as various other tasks around the gas chambers and crematoria.It has been speculated that Frenzel helped in the design of the gas chambers at Hadamar.Like his colleagues, this was Frenzel's first experience with gassing and burning people, which proved useful later in the extermination camps.