All supply and recirculated ambient vault air shall be filtered. Particulate filters shall be changed at least quarterly, or more frequently as needed, to achieve the efficiency rating cited immediately above. Gaseous contaminants shall be controlled by means of activated charcoal filters. 4.0 Acetic Acid 10.0 Mold and acetic acid are both detectable by smell. Mold creates a musty odor.
Acetic acid smells like vinegar.
Both are indicators of potentially serious problems. Fluorescent lighting shall be used in the NLM vault. Exposure to ultraviolet light shall be controlled by keeping lights off at all times except when work is being performed in the vault. Documentation of Vault Conditions. Recording devices shall be calibrated in accordance with the manufacturer's recommended schedule.