Totally Enclosed Fan Cooled and Totally Enclosed Non-Ventilated motors are specifically designed for all general purpose industrial applications in which the environment is dusty, dirty and/or humid. These motors are enclosed to reduce the exchange of air between the inside and the outside of the motor. Although not considered "air-tight", this minimizes the possibility of contaminants in the environment from entering the motor. These products assure a long lasting, reliable motor for your application.