Zeta Fresh Air G201 w/ PFU PAPR Parts FAQs
Spare filters, seals, hoses and fittings for a powered-air welding helmet system, and how to match them to your unit.
Which parts of a powered-air welding helmet system wear out and need replacing?
Most of the wear is in the consumable parts. The pre-filter and particle filter load up with fume, a gas filter (where fitted) is used up by gases, and the neck protector, face seal, headband or sweatband and visor fittings wear, stiffen or tear with use. The breathing hose, belt or harness and the battery are longer-life parts but still need checking for damage.
A good habit is to look over every part before each shift and replace anything damaged, worn or no longer fitting snugly. Your manual shows which parts your unit uses and how often the maker suggests checking them.
How do I work out which replacement filter fits my powered-air unit?
Start with the manual and the markings on the blower unit and on the old filter. Filters are normally made to suit a particular blower, so a filter that screws or clips on is not automatically the right one. Check the filter type (particle or gas), its class marking and any part number printed on it, and match them to the unit.
Also think about the job. The right filter depends on what you are breathing, so use your risk assessment and the manual rather than guessing. Never mix parts from different systems unless the maker says they are approved together.
How do I know when to change the pre-filter and the particle filter?
Particle filters are usually changed when they become loaded and the unit can no longer supply enough air. Many units warn you with a low-flow alarm or a filter indicator, and you may notice shorter battery run time as the filter clogs. If an alarm sounds, stop work, leave the fume area and check the unit before carrying on.
The pre-filter generally needs changing more often than the main filter, particularly in dusty or smoky work. Exact intervals depend on the maker, the amount of welding and grinding, and the environment, so follow the manual and your own experience.
How long does a gas filter last, and can I rely on smell to tell me it is finished?
There is no single life for a gas filter. It depends on the gas, how much of it there is, humidity, temperature and how hard you are working. Gas filter material gives no airflow warning when it is used up, so do not rely on smell or taste alone to decide when to change it.
Set a change schedule with your safety adviser based on the maker's guidance and your risk assessment. If you do smell or taste something, leave the area and change the filter before returning to work.