... Well controllable and extremely quiet EC twin-centrifugal blower for busTECHNOLOGY R&D:Fans-tech have an individual building ... tech has achieved more than 30 technicals patents for the fans designed for automobiles, telecommunications,air conditioning,range hoods,etcMoter ... on both sidesMotor insulation class: FApprovals: CE,CCC Suitable for automotive air conditioner system of bus, public traffic bus, ...