Delta Electronics FFB DC Axial Fans are built for high performance and feature a dual blade as well as a high air flow rotating stator blade. Delta FFB standard DC axial fan series has a plastic impeller and frame, as well as Delta’s maintenance-free ball bearing system. FEATURES Bearing type - ball bearing Impeller and frame material - plastic (UL 94V-0) Lead wires UL 1007 AWG #24 or equivalent Red wire positive (+) Black wire negative (-) Voltage - Rated 24VDC Size / Dimension Square - 40mm L x 40mm H Width 28.00mm Air Flow 15.8 CFM (0.442m³/min) Static Pressure 0.509 in H2O (126.8 Pa) Bearing Type Ball Fan Type Tubeaxial Noise 45.0 dB(A) Power (Watts) 2.40W RPM 9500 RPM Termination 2 Wire Leads