<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (June 2014) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (June 2014) (Learn how and when to remove this template message) </Td> </Tr> <P> A laminar flow cabinet or laminar flow closet or tissue culture hood is a carefully enclosed bench designed to prevent contamination of semiconductor wafers, biological samples, or any particle sensitive materials . Air is drawn through a HEPA filter and blown in a very smooth, laminar flow towards the user . Due to the direction of air flow, the sample is protected from the user but the user is not protected from the sample . The cabinet is usually made of stainless steel with no gaps or joints where spores might collect . </P> <P> Such hoods exist in both horizontal and vertical configurations, and there are many different types of cabinets with a variety of airflow patterns and acceptable uses . </P>

When should a laminar flow cabinet be used