Abstract: A safety visor having a face screen (6) supported by a head-harness (1, 2), the face screen (6) having sealing means (22) to enclose the space between the face of a wearer and the face screen (6) and also having means (12) for providing a flow of clean air under elevated pressure to the space from above the face, in which the face screen (6) is provided with an upward extension (3) having a cavity which is connected to the space and is provided with a readily detachable unit (12) which can be attached to the cavity in an air tight manner, the unit (12) having an air filter (20) to be located within the cavity and a pump (36, 37) to pump ambient air through the filter (20) into the cavity and then into the space. The face screen (6) with the extension (3) is rotatable about the head-harness (1, 2) in order to allow the face screen (6) to be moved to an inoperable position above the head of a wearer when not required.