Design feature: 1) Size:120 x120 x 25mm 2) Bearing system: ball bearing and sleeve bearing 3) Impeller: plastic with fiber glass filed UL 94-V0 4) Housing: plastic with fiber glass filed UL 94-V0 5) Motor: DC brushless 6) Speed: H-high speed type, M-medium speed type, L-low speed type 7) Other voltage: DC5V,DC12V, DC24V, DC48V 8) Certificate: UL/C-UL, CE,ROHS