4. Design a general ventilation system

4.1 Distinguishing between non-specific and specific pollution areas

• Premises with non-specific pollution: "Premises in which pollution is linked solely to human presence, with the exception of sanitary premises" (article R. 4222-3/3° of Code du travail ).

• Premises with specific pollution: "Premises in which dangerous or annoying substances are emitted in the form of gases, vapors, solid or liquid aerosols other than those linked solely to human presence, as well as premises which may contain sources of potentially pathogenic micro-organisms and sanitary premises" (article R. 4222-3/4° of...