Bangaren fan a cikin AHU ya ƙunshi fanka centrifugal mai shiga biyu, mota da motar V-belt wanda aka ɗora a kan firam na ciki wanda aka dakatar da shi ta hanyar hawan igiyar girgiza a cikin firam na waje wanda za a iya fitar da shi.An ɗora naúrar fan ɗin a cikin madaidaicin dogo guda biyu waɗanda aka ɗaure zuwa na'urar sarrafa iska, kuma ana haɗa buɗaɗɗen fanti zuwa sashin fitarwa na naúrar ta hanyar haɗi mai sassauƙa.