Gawo la fan mu AHU limakhala ndi cholumikizira chapawiri cha centrifugal fan, mota ndi V-belt drive zoyikidwa pa chimango chamkati chomwe chimayimitsidwa ndi zida zomangira zoletsa kugwedezeka mu chimango chakunja chomwe chimatha kutulutsidwa.Chipinda cha fan chimayikidwa muzitsulo ziwiri zopingasa zomwe zimamangiriridwa ku gawo loyendetsa mpweya, ndipo kutsegulira kwa fan kumalumikizidwa ndi gulu lotulutsa la unit pogwiritsa ntchito kulumikizana kosinthika.