A streamline flow cupboard could be a rigorously encircled bench designed to stop contamination of biological samples, or any particle sensitive materials.
Air is drawn through a HEPA filter and blown very swish, 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 wherever spores would possibly collect