▎ 摘　　要

NOVELTY - The utility model claims a new bidirectional flow fan for the outdoor conveying to the outdoor fresh air and the indoor air discharge to conveying chamber and used for processing the return air in the room. it comprises fresh air and discharging air are filtered by a first filter screen and a second filter screen, the fresh air and discharging air from the second filter screen orderly enter into graphene heat exchanger and a third filter screen, the indoor return air through the return opening into the second filter then enters graphene treatment, total heat exchanger the fresh air and discharging air of the indoor return air and outdoor are fully heat the graphite alkene in the exchanger sufficient energy exchange, graphene is total heat total heat exchanger exchanger graphene modified permeable membrane material, membrane material itself has antibacterial performance, so the dust particles will not be adsorbed on the surface of the film material, the graphene is full-heat exchanger lifetime without maintenance efficiency, but also guarantees the clean air chamber.