1.  Class IIIb and IV Laser facilities must be equipped with adequate shielding (e.g., thermal curtains using materials approved by the University’s Fire Marshall, window glass that does not transmit direct laser radiation or the specular or diffuse reflections of the laser radiation (shutters or filters)). Portals and viewing windows must be designed to prevent any exposure above the permissible threshold limit value.

_{ANSI Z136.1}

_{CRC Handbook of Laboratory Safety, 4th Ed.}

2.  Class IIIb and Class IV laser facilities must be in rooms secured by locks. Class IV laser installations must be provided with interlocked warnings that indicate the status of the laser prior to entering the facility.

_{ANSI Z136.1}

3.  Electrical outlets need to be positioned is such a manner that leakage of water coolant will not lead to risks of electrocution.

_{ANSI Z136.1}