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Frequently Asked Questions
How does a standard filter fail in heat?
By binder breakdown, not by melting.
Adhesive sealing media to frame lets go.
Board frames char and distort.
The filter then sheds fibres downstream.
It happens well below assumed temperatures.
That is why this is a separate family.
Which temperature figure should be specified?
Two of them, and they differ.
Continuous operating temperature is the first.
Peak excursion the filter must survive is the second.
A filter chosen on average fails at the first upset.
Excursions happen during start-up and faults.
State both when enquiring.
Does efficiency hold at temperature?
Not automatically, and this surprises buyers.
Media behaviour changes when hot.
A rating measured cold may not apply.
Ask for efficiency at operating temperature.
Catalogue figures are usually ambient.
The difference matters on critical duties.
What changes in the construction?
Almost everything except the concept.
Media moves from synthetic to glass fibre.
Binders change or are removed entirely.
Frames move from board to metal.
Sealants become high temperature compounds.
Cost rises several times over.
How do the three types differ?
By geometry rather than principle.
Pocket construction gives area in depth.
Panels suit shallow housings.
Oven and furnace grades sit at the top of the range.
Housing depth usually decides.
Match the geometry to what exists.
Where are these actually used?
Downstream of heat, or protecting it.
Ovens, furnaces and kilns.
Powder coating and paint curing.
Turbine and process air intakes at temperature.
Anywhere a normal filter would degrade.
The airstream temperature decides, not the industry.
How is filter life judged here?
By pressure drop, as always.
Thermal cycling also ages the media.
Visual inspection matters more than usual.
Look for frame distortion and media sag.
A degraded filter can pass debris downstream.
Inspect at every planned shutdown.