Bohler Evolution Vision 65FM Air Parts FAQs
Answers on choosing, fitting and looking after the filters, lenses, comfort parts, battery and blower parts for a powered air welding helmet.
How do I work out which replacement part fits my powered air helmet?
Start with the data plate or label on the helmet and blower, then the manual's parts list. Note any part number or marking moulded into the old part, and check the part against the helmet itself before ordering.
Powered air helmets are usually built as a system, so filters, covers, lenses and hoses are normally made for one family of helmets and one blower. A part that looks similar but is not the specified one can change airflow, fit or the protection the equipment was approved for. If the old part is worn beyond reading, our team can help you match it from the data plate details.
What does the filter cover do and how often should it be changed?
The filter cover holds a coarse pre-filter and usually acts as a first barrier against sparks and larger particles, which helps protect the main particle filter behind it. It takes the heaviest wear, so it is normally changed far more often than the main filter.
How often depends on the maker, the process, the material and how dusty the work area is. Some makers suggest changing a pre-filter once or twice a week in regular use, but follow your manual. Change it sooner if it is visibly dirty, clogged, damaged or burnt, and never run the blower without the covers and filters fitted.
How do I know the main particle filter needs replacing?
Common signs are a low-airflow alarm, a filter indicator showing it is spent, a much shorter battery run time than before, or visible damage or heavy contamination. A harder-to-breathe or weaker flow of air is also a warning.
HSE guidance says filters should be changed when damaged or visibly contaminated, and fan-assisted units should follow the manufacturer's instructions for changing them. Some makers also set a minimum change interval even if no alarm has sounded, so check your manual. If an alarm sounds, leave the work area and fix the cause before welding again.
Will a replacement particle filter protect me from welding gases?
Not necessarily. A particle filter is designed to remove fume and dust, and HSE notes that P3 particle filters do not protect against the gases that can be present in welding fume. If a gas or odour filter is fitted to your blower, it must be one the maker specifies for that unit.
If you notice a smell, irritation or taste while welding, treat it as a sign that exposure is not under control. Stop and review your ventilation and respiratory protection with your employer or safety adviser. Do not rely on smell as a way of judging when a filter is used up.