Motor Dampening Bars are designed to reduce vibration and structure borne noise levels from the motor to the mounting surface. Standard Features: Average expected reduction of structure borne noise is 3 - 4 dBA Full mounting range for NEMA frame motors Two are required per motor Available in bolt down and weld down styles for easy installation Horizontal installation only Operating Temperature: Recommended operating temperature is -40 to +167 F Caution: Not intended for use in vertical applications