The Verdrehung Fan Time Machine is a fictional concept, and I cannot provide any information about its functionality or whether it allows for forward or backward time travel.
Time travel is a topic that has been extensively explored in science fiction, but it remains purely speculative from a scientific standpoint. The possibility of time travel, as described in popular culture, poses numerous theoretical and practical challenges that have not been resolved or confirmed by scientific evidence.
In physics, there are various theoretical models and thought experiments that discuss the concept of time travel, such as wormholes, cosmic strings, or closed timelike curves. However, these concepts are still speculative and remain purely theoretical at present. The study of time travel is an active area of scientific research, but no conclusive evidence or practical applications have been established to support its feasibility.