Abstract: A controlled atmosphere workstation comprising a transparent housing (1) having a pair of apertures (21, 22) through which can be inserted the hands of a user. The chamber has a forward part defined at least in part by a pair of opposed side wall portions (7, 10) which converge towards the front of the chamber, in which the apertures are provided. There is a font panel (3) and an upwardly inclined top viewing panel (13). The housing is mounted on a base (2) and contains a gas circulation system which directs filtered gas onto the side walls of the chamber on both sides, and then re-circulates the gas into a gas circulation chamber provided with fans (31, 32) on either side, feeding outlets (27, 28).