size120x120x25mmconstruction glass fiber reinforced plastic; impeller and housing PBT are UL 94V-0 ratingoperating temperature sleeve bearing -10℃ to +70 ℃ball bearing -10℃ to +90 ℃insulation resistance 10meg Ohm min, at 500 VDC (between frame and terminal)dielectric strength 5mA max, at 500 VAC 60Hz one minute (between frame and terminal)life time sleeve bearing: 30000 hoursball bearing: 50000 hours