RoHS compliant duct and inline box fans. Sizes from 100mm (3.9") to 315mm (12.4") in 120V and 240V. Airflow from 110 CFM to 989 CFM. High efficiency design, lubricated maintenance-free ball bearings, vibration-free operation, low noise, compact and rugged construction. IP44 rating w/30,000 hours operation. Insulation Class F.