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Safety alert from HSE: There has been a change in enforcement expectations for mild steel welding fume after new scientific evidence that exposure to mild steel welding fume can cause lung cancer and possibly kidney cancer in humans. As a result HSE has issued a safety alert, click here to read more.
Replacement Filters for Plymovent Systems. In a Plymovent welding fume extraction system the filters are an important part. Replacing these filters with a generic replacement may reduce the performance of the system. Therefore we recommend the use of Plymovent filter cartridges only.
Straight answers to the questions people ask most when choosing replacement filters for welding fume extraction systems.
Use the unit's data plate and manual to identify the exact filter type and size. Filters vary in shape, media, surface area and sealing method, and units are designed around a specific filter.Never choose by appearance alone. Note the filter's reference and dimensions from the old one, and ask our team if you cannot identify it.
A filter is a key part of the system's performance. A filter that differs in size, media or sealing can reduce airflow, let fume bypass the media, or stop automatic cleaning from working properly.That can mean poor protection for people and damage to the unit. Use a filter specified for your unit unless the manufacturer confirms an alternative.
Most units have a pollution indicator or pressure gauge that shows when the filter is loaded. Other signs are weaker suction at the hood, more frequent cleaning cycles, and more dust or smell in the workshop.Change the filter when the indicator says so or if airflow cannot be restored by cleaning. Keep a record of change dates to help plan.
These are different filter formats, and the names vary between makers. Cartridge filters are usually pleated tubes giving a large filtering surface in a compact space, and are often cleaned by pulses of air. Bag filters are fabric pockets, and panel or cassette types are flat elements.The unit is designed around one format, so the data plate and manual for your own machine will tell you which type and size fits. Each has its own fitting and cleaning method.
A pre-filter catches larger particles before they reach the main filter, so the main filter lasts longer. Some pre-filter stages also help reduce the chance of sparks reaching the main filter, but only if the maker designed them for that purpose.Pre-filters are normally quicker to change than main filters and may need cleaning or replacing more often. Check the manual for your own unit for the type to use and how often to check it.
It adsorbs gases, vapours and odours that ordinary particle filters cannot catch, for example from some solvents, coatings or certain processes. It is usually an additional stage after a particle filter.Carbon filters become saturated and need replacing on a schedule based on the contaminants and use. They do not trap solid fume particles.