![]() ![]() Clean benches are usually classified according to the number and size of particles permitted per volume of air in a specific amount of time. The air that bathes a product in a clean bench needs to be free of contaminants. An object being bathed with clean, turbulence-free, laminar airflow will remain clean and protected from nearby contamination.Clean benches with either vertical or horizontal laminar airflow provide the cleanest working environments because HEPA-filtered air within these benches is unidirectional and turbulence-free. (Unidirectional is airflow having generally parallel stream lines, operating in a single direction with uniform velocity over its cross section.) Laminar airflow is the most efficient option for removing particulate contamination from a controlled area because the airflow uniformity and lack of turbulence keep clean airstreams from mixing with contaminated airstreams. Laminar flow refers to a state in which non-turbulent streams of air flow in one direction parallel to one another. Start your cleanroom project Contact an Expert! Contact Us KEY PRINCIPALS OF CLEAN BENCH PERFORMANCEĬlean benches employ two key principals that are critical to maintaining a contaminant-free environment - laminar airflow and filtration. When used outside a cleanroom, a clean bench does not require a worker to be gowned, although individuals often wear gloves and arm coverings when using a bench as an extra measure of protection against particulate contamination. It is often more economical to supplement a cleanroom with clean benches to create localized Class 100 or Class 10 areas, rather than make the entire cleanroom Class 100 or Class 10. Clean benches can be used as stand-alone solutions or they can be installed inside a cleanroom. Clean benches are a convenient method of creating a Class 100 (ISO 5) or Class 10 (ISO 4) clean air environment within a larger work area. Laboratories and test and inspection areas are also common sites for clean benches. Many manufacturing environments, such as semiconductor, pharmaceutical, medical device, food, aerospace and nanotechnology production, require that products be kept free of particulate contamination. Clean benches range in size from compact tabletop versions to larger cabinets. A clean bench (also called a laminar flow bench or laminar flow workstation) is a piece of equipment designed to create a micro-environment that meets industry standards for particulate control. If you’re considering a laminar-flow clean bench to meet ISO or other manufacturing standards for particulate control, here is what you need to know to select the right horizontal- or vertical-flow bench for your application.
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