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Frequently Asked Questions
Why choose a panel rather than a pocket filter?
Because the housing is shallow.
Existing plant often has a panel-depth track.
The airstream has become hotter than originally intended.
A panel fits without modifying the unit.
Pocket construction needs depth to work.
Housing geometry usually decides.
What changes in the construction?
Frame, media, separators and sealant.
Board frames become galvanised or stainless steel.
Synthetic media becomes glass fibre or ceramic.
Sealants become high temperature compounds.
The hottest grades remove organic binder entirely.
Only the shape stays the same.
What limits panel service life?
Media area for the face size.
A flat panel holds relatively little.
Face velocity is therefore high.
Pressure drop rises quickly as it loads.
Intervals are shorter than a pocket filter gives.
That is the price of fitting a shallow track.
Does thermal cycling matter?
More than continuous heat does.
Heating and cooling works media against frame.
Batch processes cycle daily.
Those filters age faster at the same temperature.
Continuous service is gentler.
Allow for it in the change schedule.
How should these be inspected?
Visually as much as by pressure.
Look for frame distortion after heat.
Media sag indicates binder degradation.
Separation at the seal is the failure to catch.
A degraded filter passes debris downstream.
Inspect at every planned shutdown.
Does airstream chemistry affect the choice?
Yes, alongside temperature.
Acidic or solvent-laden air attacks frames.
Galvanised steel suits some duties and not others.
Stainless grades handle more.
Media compatibility matters as well.
Describe the airstream, not just its temperature.
Can a standard panel be used at moderate heat?
Only within its stated limit.
Standard filters have a real ceiling.
Exceeding it degrades binder and adhesive.
The failure is gradual and invisible.
Check the manufacturer's figure.
Peak excursions matter as much as average.