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Frequently Asked Questions
How is this different from particulate filtration?
It captures molecules rather than particles.
Adsorption onto internal surface area, not interception.
A particulate filter improves as it loads.
A molecular filter gets worse as it loads.
Capacity is finite and being consumed continuously.
Almost nothing carries across between them.
Why can differential pressure not manage these?
Because saturation barely changes resistance.
A spent carbon filter looks like a new one.
It weighs only slightly more.
The gauge that manages every other filter says nothing.
Life is predicted from loading instead.
Media sampling confirms it.
What is contact time and why does it decide removal?
How long the gas stays within the media.
Adsorption is not instantaneous.
Bed depth and face velocity set it.
More air through the same bed removes less.
Filter area alone does not fix it.
Design the bed, not the frame.
Does the media have to match the gas?
Yes, and plain carbon is not universal.
It suits many organic vapours well.
Several common inorganic gases it handles poorly.
Impregnated media or another adsorbent is needed.
Name the target gas before selecting.
A generic specification produces poor results.
How is remaining life actually established?
By calculation, then by sampling.
Loading is estimated from concentration and airflow.
That gives a predicted change interval.
Media samples can be tested for remaining capacity.
Odour breakthrough is the crude last indicator.
Waiting for smell means it has already failed.
Does humidity affect performance?
Considerably, and it is often overlooked.
Water vapour competes for adsorption sites.
High humidity reduces capacity for the target gas.
Some media tolerate it much better.
State the humidity range when selecting.
It changes predicted life significantly.
Is particulate filtration still needed?
Yes, and it belongs upstream.
Dust blinds the media surface.
That blocks access to the internal area.
A cheap pre-filter protects expensive media.
Combination filters do both in one frame.
They expire on two different schedules.