1. Sample protection only
2. Work bench or similar enclosure, which creates a particle-free working environment by taking air through a filtration system and exhausting it across a work surface in a laminar or unidirectional air stream.
3. Enclosed on the sides and kept under constant positive pressure in order to prevent the infiltration of contaminated room air.
4. Widely used in medical research laboratories, hospitals, manufacturing facilities and other research and production environments.