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Filters, seals, hoses and spares for one maker's powered air welding helmets: what each type of part does and how to choose and look after it.
Powered helmets and hoods with a loose-fitting head top are covered by the European standard EN 12941. It sets performance classes TH1, TH2 and TH3, with a higher number meaning better filtering and less leakage into the head top. Each class can be used with particle, gas or combined filters.When choosing a replacement filter or other part, match it to the class and combination named in the maker's manual and on the data plate. The protection depends on the whole assembly of helmet, hose, blower unit and filter, so do not mix and match without the maker's approval.
A powered unit only protects if it provides enough filtered air to the head top. The HSE says maintenance of powered respirators includes checking the battery charge and the flow rate, and makers describe a simple flow indicator test before use. If the flow is below the minimum, do not use the unit until it has been examined and repaired.If an alarm sounds while you are working, leave the work area and find the cause. A blocked filter, a flat battery or a leaking hose or seal are common reasons. Follow your own manual.
The right timing depends on the maker, the type of filter and how dusty or fumy the work is. The HSE says the manufacturer's maintenance schedule, including recommended replacement periods and shelf lives, should always be followed.Typical signs a filter needs changing are shorter battery run time than before, a low-airflow alarm even with a charged battery, or damage. Heat, dust and spatter shorten life. Do not wash or tap out a particle filter unless the maker says that is allowed, and always fit the correct type for the unit.
The HSE says RPE should be inspected thoroughly before each use and that, for reusable RPE, you should keep a record of regular examinations, maintenance, repairs and, where appropriate, testing. Checks usually include the seals, hose, helmet shell, filters, battery and airflow.What counts as an adequate schedule depends on the equipment and the maker's instructions. HSE guidance explains who should carry out maintenance: trained, competent people. Report anything damaged and take it out of use until it is put right.
