Large axial flow fan 1,Size:172*151*51mm 2,CE and CCC and ROHS 3,a variety of design 4,High quality Large axial flow fan 1,Size:172x151x 51mm,2,Frame: Durable-Cast Aluminum3,Impeller:PBT Thermoplastic ,Black,UL-94-VO4,Bear type: Ball bearing; Sleeve bearing5,Life expectancy-at room temperature: 50000(sleeve);80000(ball) large axial flow fan