All biological safety cabinets, incubators, refrigerators, freezers, and liquid nitrogen storage containers used for biohazardous materials of RG 2 must be posted with "Biohazard" signs; RG 1 materials may be posted. This is the minimum signage requirement. Where regulations require higher levels of warning signage, this must be done. The equipment must be kept locked at all times when located in an area accessible to persons other than laboratory personnel.
The entrance to work areas used for RG 2 agents or recombinant DNA activities or designated BSL2 must be posted with "Biohazard" signs. RG 1 agents and BSL1 may be posted.
A sign or label giving the name(s) and telephone number(s) of responsible person(s) who may be contacted in case an emergency occurs when the laboratory is not in operation, must be affixed to Biohazard signs posted at the entrance to work areas and on biohazard storage facilities located in unrestricted corridors and rooms that use RG 2 agents or rDNA or are designated BSL2. RG 1 agents and BSL1 areas may be posted.
