Zeta Fresh Air W201 w/ PFU PAPR Parts FAQs
Filters, covers, lenses and wear items for a powered air-purifying welding respirator, and how to work out the right ones.
When should I replace a cracked visor, cover lens or headtop?
Replace a visor or cover lens as soon as it is cracked or damaged, because a damaged one can hide further cracks and may no longer protect your face or eyes. Keeping visors clean helps you spot cracks early.
A helmet-style headtop should be replaced at the end of its service life, and it should be checked carefully after any heavy impact. If there is any damage or doubt, take it out of use and follow the maker's instructions on whether it must be replaced. Do not repair a damaged part with tape or adhesive.
What is the difference between particle filters and gas filters, and how do I read the colour bands?
A particle filter catches dust and fume, such as welding fume, but it does not remove gases or vapours. Gas filters are designed for particular gases, so they only help if they match the hazard you have identified.
Filter colour bands show what a filter protects against. Particle filters are white and marked P. Brown, grey, yellow and green bands cover different groups of gases and vapours, and combined filters carry more than one band plus a class number. For welding, which filter you need depends on the process, the metals and fumes involved and your risk assessment, so check this before you buy.
Do I need a face-fit test with a powered welding helmet, and what about a beard?
Tight-fitting masks rely on a seal against the skin, so the wearer must be face-fit tested and clean shaven where the seal sits. Facial hair and stubble can let contaminated air leak in.
A powered respirator with a loose-fitting hood or helmet does not rely on a face seal in the same way, and is often used by people who cannot pass a fit test or who have a beard. Check your own unit's manual to confirm it is a loose-fitting type and what it requires. Your employer's risk assessment still decides what is suitable.
Is a powered respirator enough on its own to control welding fume?
Not necessarily. The HSE's welding guidance puts controlling fume at source first, usually with local exhaust ventilation, and uses respiratory protection where that cannot adequately control exposure. Outdoors, where extraction is impractical, suitable respiratory protection is needed.
For longer welding jobs the HSE points to battery-powered air-fed equipment with a minimum assigned protection factor of 20. Whether your equipment meets that is shown in the maker's marking and manual. Replacement parts must keep the unit within its approval, so use only what the maker specifies.