Delta+ 90 XFA with FA Flow Control Parts FAQs
Plain answers on the filters, battery, lenses and comfort parts that wear on a powered air-purifying welding helmet system, and how to choose and look after them.
How do I know when to change the filters?
Filters only have a limited capacity and can become clogged. Change them in line with the manufacturer's recommendations and also if they have passed their shelf-life date, are damaged or visibly contaminated, or if breathing becomes harder or the airflow warning operates.
Filters cannot be cleaned and reused, and how often they need changing depends on how much welding you do, the fume produced and the workshop conditions. Check the filter and its seal at each use, and keep a record of changes.
What should I do if the airflow drops or the fan stops?
Stop work and leave the work area immediately. Never keep working if the fan stops or the airflow rate falls, because a loose-fitting helmet relies on a continuous supply of clean air to keep fume out.
Once in clean air, check the likely causes in turn: a flat or worn battery, a clogged pre-filter or main filter, a kinked or damaged hose, a poorly seated filter cover or seal. If the airflow does not return to normal after these checks, do not use the unit until the maker's instructions have been followed or a competent person has examined it.
What is the difference between a pre-filter and the main filter, and how do I choose them?
A pre-filter is a coarse layer that catches larger dust and spatter before it reaches the main particle filter, and so extends the main filter's life. It usually clogs sooner and is changed more often, but the right interval depends on the maker and how heavy the work is.
For welding fume you need particle filters. Check that the filter type and class are the ones named for your helmet and blower in the manual, and do not mix filters from other systems, because the approval of the combination depends on the correct parts.
Should I use original replacement parts or similar ones?
Ideally, any parts that need replacing come from the original manufacturer of the equipment. This helps the equipment keep working as originally intended and give the protection the maker states.
A filter, hose or seal that looks the same may differ in fit, airflow resistance or approval. Use the parts list in the manual, and quote the information on the blower's label or the old part's markings when you ask a supplier to confirm what suits your system.