Occasionally, there may be a loss of electrical power for an extended period of time. There are emergency circuits that are powered by an on-campus diesel-fired generator. Emergency lighting is connected to these circuits as well as 'essential' items such as some freezers. Emergency power should be in operation 15 seconds after the loss of power. When operating in Emergency power, airflow in the building is reduced. There is sufficient airflow to ventilate fume hood and Type B safety cabinets with the windows closed but not to provide operator protection with the window open. Type A Biosafety Cabinets should not be used when operating in Emergency Power.
In the event of a power outage all fume hoods and biosafety cabinets must be closed.
If the interruption to exhaust has resulted in a hazardous leak of chemicals, vapours or biohazards then treat this situation as an emergency and pull the fire alarm to ensure a prompt evacuation of the building and that the emergency services are summoned.