11938MB/4715MS AC Axial Fans NMB Technologies 11938MB/4715MS AC Axial Fans are an be an integral part of a cooling solution for heat-generating applications. The series is offered in a voltage range of 100V to 240V and an airflow range of 45.9CFM to 102CFM. The fans feature a shaded pole induction motor and an expected life of 100,000 hours. NMB Technologies 11938MB/4715MS AC Axial Fans operate in a -10°C to +70°C temperature range.