These kits are used for converting 150 and 170 Series Cast-Iron, TEFC motors and Rolled Steel TEFC motors to Totally-enclosed Blower Cooled motors. Cooling per MG1.6 (IC46). The kits are designed for inverter and vector duty applications where continuous cooling is required regardless of motor shaft speed. These kits are mounted on the back of the motor after removing the fan guard and fan. No modification to the motor is needed for mounting these blower kits.