• Fan & Blower - Capacitor Start, Dripproof Motors • Resilient Base Motors (Single & Two-Speed) • Ball bearings, except as noted • Heavy gauge steel frame and base • Service factor, as noted • Capacitor start / capacitor run as noted • Thermal protection, as noted • 48Y and 48YZ frame have 48/56 frame mounting holes • UL recognized and CSA certified • Model 056C17D5339