HAZMAT Control supply a complete range of escape sets for use across sectors including Shipping, Petrochem, Groundworks and Industry. The Scott Safety and MSA Premair ranges use pressurised cylinders to deliver either a Constant Flow of 10 or 15 minutes of escape time or 10 or 15 minutes of escape time based upon a breathing rate of 40 litres per minute for the Positive Pressure versions.
The advantages of Constant Flow escape sets such as the Elsa are 2-fold; firstly operatives with facial hair and / or glasses can safely wear the cuboid hoods, secondly a full 10 or 15 minutes of escape time is assured. The downside to these systems is that during heavy exertion an operative may require a greater air-flow than is being delivered and this increases user stress. By contrast, the Positive Pressure escape sets will deliver an air-flow to suit user demand, however in doing so can reduce the escape time available.
The Avon Protection NH15 CBRN Escape Hood does not rely on a pressurised air source and gives a minimum of 15 minutes escape time. Unlike the cylinder escape sets it is very lightweight and does not require annual servicing. The shelf life for an NH15 unopened is 5 years; the drawback to this type of Negative Pressure escape hood is that the O2 content needs to be a minimum of 18% volume so not advised for use for escape from a Confined Space.