Suggested replacement:  Canarm McMillan Industrial de fan Motor R-P1000-B4. 8213917501, Wall mount fan Motor. Model AX series shutter mounted exhaust fan motors. AX8-3, AX10-3, S8-B2, S10-B2 
Application: National Fan Co. NFC-SF10BS, Industrial, exhaurst fan, Commercial, Farm.
 
Horsepower : 1/20
Voltage : 115
Amps : 1.70
Speed: 02
RPM : 1600
Frequency : 60 Hz
Length : 2-7/8”, Conduit Box
Enclosure : Totally Enclosed
Shaft Dim. : 5/16” x 1-3/4”
Type : Shaded Pole
Diameter :3.3”
Bearings : Ball
Rotation : CWSE
Protector : Thermally Protected
Service Factor : 1.00
Phase : 1
Ambient Temp. : 40°C
Option: RAC-EC5408E
White - Com, black - HI, Red - Low, GRD - Green