Chicago blower SN#A4967-HDX-1 2400-PA, Model BL-366. Radial bladed wheel. Wheel is approx. 4" wide x 26" diameter. Blower is pressure blower design and is insulated. Motor Allis Chalmers type RG2 frame 324TS 40 HP RPM 3535 460 volts 45.9 amps is 40 HP direct drive, arrangement 8. 3600 rpm. Manufactured by Chicago Blower Company. Orientation counterclockwise, top horizontal. 12-13/16" inlet diameter. 6-1/2" x 12-5/8" rectangular flanged outlet. Unit comes complete with vibration isolation base and is insulated. Performance curve on file. Demonstration video available.