Walk-in fume hoods are basically floor mounted units where the floor itself is considered as a working surface. Walk-in fume hood is used for tall assemblies or large apparatus like kilo scale - High volume reactions etc. Sometimes it may be used as for a storage of containers that is prone to some hazard, but may not fit in to defined storage cabinet. Generally, it has horizontal sliding sash, although some models are equipped with telescopic vertical sliding sashes. For safety reasons, horizontal sliding sashes are always recommended in walk-in fume hoods.