... option 4.exhaust fan at the end of machine KC-G1 CAR SPRAY BOOTHAIR FLOW ROUTE: Semi-down darft: Air enter ... centrifugle fan Exhaust duct3m straight ducts, one 90° bend,one 60° bend FiltrationsystemRoof filter2pcs, moounted above support frame, made of steel ... .9x2.73.02.6618,0000.25-0.37Sallon car KC-G1 CAR SPRAY BOOTH