Closed doors when work is in place or no one is present

Doors have locks to restrict entrance and PI limits access to the lab to individuals who meet specific entry requirements. Maintain doors closed during experiments and lock unattended laboratories.

In addition, doors should be shut as buildings are designed to maintain negative directional air flow from the corridor to the labs and if doors are left open, the building’s ability to do so may be compromised.


  • Biosafety in Microbiological and Biomedical Laboratories, 5th Edition. Section IV: BSL2 A.1, D.1.
  • MSU Chemical Hygiene Plan. Section 5.1.3. MSU Biosafety Manual
  • MSU Bloodborne Exposure Control Plan

Corrective actions:

Always lock doors when no one is in the lab and maintain doors shut when performing work. Question anyone requesting access to the laboratory as to their purpose and require proof of identification.