... with gear box 1.Steel Rolling Door 2.Automatic Ceiling 3.Reduction ratio:1/3.6,1/4.25,1/12.96, 1/18,1/46.66 gear ... .6,1/4.25,1/12.96, 1/18,1/46.66,1/55,1/65.03,1/77,1/167.96, 1/198.1/234,1/276,1/3264.ypical Applications Steel Rolling ... Door Automatic Ceiling steel rolling ...