Plastics portable ventilatorColors: yellow, blue.Size:8" 12" Voltages:110v-220v Speeds:2800r/min or 3300r/m Frequencies: 50Hz or 60Hzcharacter: Our JIALONG series portable propeller ventilator has many strong points such as excellent function,light weight, novel design,special manufactured for underground cable maintainance,shipping making,exhaust for fire fighting, piping construction and in other violent working situation for ventilator. with good insulation, high pressure and large air volume character. Portable ventilator connect with flexible duct,with easy to carry characteristics, It can be used at tunnel, basement, ship building or welding, laboratory ,warehouse to ventilate waste air,harmful gas,dust ect.