Abstract: An air extraction and treatment unit is located above a source of contaminated air. The apparatus has a series of ultraviolet tubes for treating the decontaminated air. The unit is arranged such that in use substantially no direct or reflected ultraviolet light is visible from outside the unit. Furthermore even when a removable filter is removed, there is no direct line of sight to the ultra-violet source. The unit further has a first switch being disposed between a first filter and the unit. The first switch modulates the ultraviolet tubes between at least a first condition and a second condition.

Abstract: An air extraction and treatment unit (2) is located above a source of contaminated air. The apparatus has a series of ultraviolet tubes (20) for treating the decontaminated air. The unit is arranged such that in use substantially no direct or reflected ultraviolet light is visible from outside the unit. Furthermore even when a removable filter (4) is removed, there is no direct line of sight to the ultra-violet sources.

Abstract: An air extraction and treatment unit is located above a source of contaminated air. The apparatus has a series of ultraviolet tubes for treating the decontaminated air. The unit is arranged such that in use substantially no direct or reflected ultraviolet light is visible from outside the unit. Furthermore even when a removable filter is removed, there is no direct line of sight to the ultraviolet source. The unit further has a first switch being disposed between a first filter and the unit. The first switch modulates the ultraviolet tubes between at least a first condition and a second condition.