Brian -
UL will generally accept a Class 1 air filter. These are evaluated against UL
900.
Otherwise, it depends on the standard for the end product what requirement
apply. I recall 60950-1 accepting HF-1.
Peter Tarver
From: Kunde, Brian [mailto:brian_ku...@lecotc.com]
Sent: Monday,
Hi Brian:
I have only a passing familiarity with the type of requirements that you are
asking about, but I can offer a few tidbits.
For telecom carrier equipment, requirement GR-63-CORE (2012) requires a
filter on all fan-cooled equipment, and contains requirements for the
filtering
Brian
>From "memory" of 60950 and the like, in view of the testing you have already
done, and because the filter is outside the fire enclosure, then, for Q1, an
HBF ("Horizontal Burning, Foam" IIRC) rating should be "adequate" to meet
the standard in the same way that a piece of external solid
Most PCs don't blow air in, they blow it out, and the air inlet is well away
from the power supply block. This tends to blow dust *out* of the innards
and seems to work well, without the use of a filter. Of course, I don't know
whether you can do that with your product.
With best wishes DESIGN
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