Abstract: This invention relates to a fume hood in which side and top walls define a space enclosed on all sides but the underside, the hood having baffle plates within the space, the plates sloping upwardly and outwardly adjacent the side walls, the plates having their upper edges spaced from the walls of the hood. Suction opening is located in the top wall centrally above the baffle plates.

Abstract: This invention provides a process for continuously removing H.sub.2 S from a fouled gas containing some oxygen. The process involves the passing of the fouled gas through a mass of porous hematite pellets in a chamber, thereby producing water and forming elemental sulphur on the pellets, and abrading the pellets to remove the elemental sulphur in a comminuted form. This invention also provides an apparatus adapted to carry out this process.

Abstract: This invention provides a method and apparatus for exhausting rising fume from a fume-producing apparatus into a hood opening located above but laterally displaced from the fume-producing apparatus. A first jet producing a moving curtain of air is directed generally across the fume-producing apparatus from the side thereof which is remote from the hood, with the curtain at least wide enough to span substantially the whole of the rising fume. A second jet produces a second moving curtain of air travelling generally upwardly toward the hood opening from a position spaced generally beneath that opening. The energy and direction of the first jet and the resultant air curtain are such that, if the second jet were not present, the resultant paths for all portions of the air/fume mixture would traverse the general region between the hood opening and the position of which the second jet originates.

Abstract: This invention provides a method and apparatus for continuously moving gas from a first to a second location within an enclosed space. The gas is drawn from and exhausted to the exterior of the space. First, the gas is admitted from the exterior to a perforated plenum, and then the gas is moved at a relatively slow-speed out of the plenum toward the first location. The high-speed jet of gas is then originated at the first location within the slow-speed gas flow, and is directed toward the second location. This entrains additional gas from the first location and urges it toward the second. At the second location, the gas moving is exhausted to the exterior.