Sterile air trolley

Claim 1

A sterile air trolley comprising: a box-like casing having a four-sided lower region and an upper region extending laterally beyond all four sides of the lower region in forming a limb at one of the sides and an overhang at each of the other three sides, an air inlet through each of the four sides of the lower region, the upper region enclosing a diffusion chamber defined by an upper surface and sides and the undersides of the overhangs and of the limb, a plurality of air outlets in the upper surface, the sides and the undersides of the overhangs and the limb of the diffusion chamber, impeller means within the lower region, a filter disposed across each air inlet, the impeller means being operative to draw air into the lower region of the casing through the air inlets and filters and out of the casing by way of the air outlets of the upper region resulting in substantially vertical air flow from the upper surface and undersides and lateral air flow from the upper region sides to provide an effective sterile air zone in the immediate vicinity of the upper region, and casters attached to the underside of the lower region.