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Modutrol IV™ Motors APPLICATION The Series 90 Modutrol IV™ Motors are spring return and non-spring return modulating proportional control motors. Use these motors with controllers that provide a Series 90 output to operate dampers or valves. FEATURES • Replaces M934A,D, M941, M944A,C,D, M945A,D,F, M954, M965, and M975 motors.