A beginner’s guide to working safely in CL2, CL3 and CL4 laboratories Welcome to your first day in a containment laboratory. You’ve completed some training. You’ve learned where the emergency exits are. Someone has probably shown you an impressive collection of PPE. And depending on the laboratory, you may have just walked through enough doors to wonder whether you accidentally boarded a submarine. There’s a reason for all of it. A containment laboratory is essentially a care

Inside the airflow, HEPA filtration, pressure relationships and failure testing that help keep high-containment laboratories contained Walk into a properly operating Containment Level 3 (CL3) laboratory and, at first glance, things may seem surprisingly calm. The lights are on. Equipment is humming. Researchers are working. Doors open and close. Air enters through supply diffusers and disappears through exhaust grilles. Nothing particularly dramatic appears to be happening. A

A HEPA filter guy’s perspective on the little machine sitting in your living room I’ve spent a large part of my career working in some of the cleanest and most controlled environments you can imagine. Hospitals. Pharmaceutical facilities. Research laboratories. Biological safety cabinets. Cleanrooms where airborne particle concentrations are measured, airflow is carefully controlled, pressure relationships matter, and HEPA filters are tested to verify that they are actually p