50-60HZ 51W POWER 6" Inline Duct Booster Fans Ventilation Exhaust Industrial Fan Circular Duct Pipeline Fan EXHAUST ,Long Lasting

6inch, airflow550m³/h, Low noise 33dB Protection Class: IP44 External rotor motor with NMB ball bearing, with safety thermal overload protection. Life expectancy:50000hours Fan working temperature:-10~+60 V0 flame-resistant PP material plastic casin