Thru-flow discharge vacuum AC motors move vacuumed air over the motor to dissipate heat instead of using a cooling fan. The air flows into the bottom of the motor and is discharged through the top of the motor to provide cooling, making it quieter than other types of vacuum motors. They have a high starting torque, operate at high speed, and create vacuum pressure and suction by a rotating motor fan. Motors must be used in very clean, no-debris environments and are used to move clean and dry air in commercial canister or utility vacuums, sprayers and foggers, material handling and transfer systems, car wash vacuums, and central vacuum systems.