HAYDEN FAN CLUTCH, SEVERE DUTY THERMAL -- Counterclockwise rotation; Turns the fan 80-90 percent of the shaft speed when engaged and 20-30 percent when disengaged; For use with 2-1/2 in. deeper pitch fans; Features land and groove design with up to 70 sq. in. of working area; Its larger working surface provides cooler running and longer life expectancy and the thicker body and deep finned faceplate dissipates more heat; Can be used in place of many clutches; With 2-year or 24,000-mile Hayden limited warranty.