Orion Fans OAB220 Series 3-Speed Fans feature three blowing speeds for added flexibility in performance versus noise. The fans include a capacitor as a cost-saving solution. The OAB220 series is constructed with a die-cast aluminum frame, a UL 94V-0-rated plastic impeller, and four 22AWG wire leads. The Orion Fans OAB220 Series 3-Speed Fans are compatible with a DR22025D steel duct ring as an optional accessory. The fans operate with a 555CFM max airflow rating and a 75.2dBA noise level. The OAB220 fans are RoHS-compliant and ideal for agriculture, ventilation, medical, and industrial equipment applications.