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Frequently Asked Questions
When is a portable unit the right answer?
When the work moves and the bay does not.
Fabrication shops rarely weld in one place.
Site work and vessel entry need mobility.
A fixed arm is better where the bay is fixed.
Capture at source is the goal either way.
Mobility is a means, not the objective.
Why does duty cycle matter so much?
Lighter units are built for intermittent use.
Running a full shift overheats or underperforms them.
Continuous rating is a heavier machine.
The specification is easy to skip when comparing.
Most disappointment traces back to it.
State the daily running hours when enquiring.
Does the material being welded change the unit?
Yes, and stainless is the case to watch.
It introduces hexavalent chromium.
That carries its own exposure limits.
Filter disposal becomes regulated waste.
A unit specified for mild steel may not suit.
Declare the materials before selection.
Should the air be recirculated or ducted out?
It depends on filtration and local rules.
Recirculating keeps heat already paid for.
That matters through a cold winter.
It demands filtration good enough to justify it.
Some fume may not be recirculated at all.
Confirm the local position first.
What does spark arrest add?
Protection for the filter media.
Grinding sparks reach the filter otherwise.
A filter fire is a genuine risk.
It matters where grinding shares the bay.
Some units include it, others offer it.
Ask rather than assume.
What makes a portable unit actually get used?
Ease of moving it to the work.
Cable length limits where it can stand.
Weight decides whether one person moves it.
The arm must stay where it is put.
An awkward unit ends up parked.
A parked extractor protects nobody.
How is filter life managed?
By differential pressure, not by calendar.
Fine media loads as fume is captured.
A gauge or indicator shows the point to change.
Some units self-clean to extend life.
Filters are the main running cost.
Budget them as a consumable.