Patent ID: 6869468

Claim:
An air extraction and treatment unit for mounting above a source of contaminated air, said unit comprising an air inlet through which said contaminated air is extracted in use, an air outlet through which decontaminated air is expelled in use, and an air treatment apparatus disposed between said air inlet and said air outlet, said unit defining a path between said air inlet and said air treatment apparatus, said air treatment apparatus having an ultraviolet light source and a barrier in said path between said ultraviolet light source and said air inlet, said barrier for blocking all direct or reflected UV light, wherein the unit is arranged such that in use no direct or reflected ultraviolet light can escape or is visible from outside the unit, the unit further comprising a removable filter disposed in said path at said air inlet, the unit being arranged such that even with the removable filter being removed no direct or reflected UV light from the unit can escape or is visible whereby no UV light will expose and harm a user.