| 摘要 |
There is disclosed a respiratory protective device, and a related powered filtering device. Known devices, suffer from a number of problems, such as liability to failure, overworking and lack of fault indication. Accordingly, one aspect of the present invention provides a respiratory protective device (5) providing a powered filtering device (10) comprising a housing (15) having at least one inlet (20) and an outlet (25), pump means (35) being provided between the at least one inlet and the outlet for pumping air therebetween, a filter(s) being provided in association with the inlet(s) and/or outlet, the outlet being connected to a first end (94) of a breathing hose (45), the second end (96) of the breathing hose being connected to a facepiece (100), the powered filtering device further comprising means (110) for controlling the pump means provided at or near the outlet of the housing for controlling air flow between the inlet(s) and the outlet(s) in response to a wearers breathing pattern. <IMAGE> |
