Laminar flow hood/cabinet- Definition, parts, principle, types, uses


A laminar flow hood or cabinet is an enclosed workstation that creates a contamination-free work environment through filters. It is designed to protect the samples or materials inside the cabinet from being exposed to airborne particles, microbes, or contaminants from the outside environment. It also protects the operator and the surrounding area from the potential hazards of the materials being handled inside the cabinet.

A laminar flow hood works by creating a laminar flow of air, which means that the air moves in parallel streams with minimal turbulence. The air is drawn from the room through a pre-filter that removes large dust particles and then passes through a high-efficiency particulate air (HEPA) filter that removes 99.97% of particles that are 0.3 micrometers or larger. The filtered air is then blown into the cabinet through a diffuser that creates a uniform and constant velocity of air across the work surface. The air exits the cabinet through an opening at the front or bottom of the cabinet.

A laminar flow hood can be used for various applications in laboratories and industries that require a sterile and particulate-free environment for handling sensitive materials, such as tissue culture, media preparation, drug preparation, electronic device assembly, etc. Depending on the direction of airflow, there are two types of laminar flow hoods: vertical and horizontal.