is necessary to ensure long-term
assembly performance.
Application-specic performance
can be changed by modifying
the size and other associated
features of the vent assembly.
Design requirements such as,
but not limited to, attenuation
values, airow rates and direction,
corrosion prevention, durability,
air particulate ltration and ame
resistance can be achieved.
A honeycomb vent is either
free-standing metallic alloy
honeycomb or an assembly
incorporating the honeycomb
with other value-added features
such as framing, plating,
gasketing, lters, etc.
ese vents are typically
incorporated into enclosures
where EMI radiation or
susceptibility is a concern, as
well as where heat dissipation
Application Design Assistance
2
What is an EMI Shielding Honeycomb Vent?
Many design variables should be considered when developing
an EMI shielding honeycomb vent design. Some features are
mandatory to ensure correct application performance.
Others exclusively oer convenience or improved performance.
Design Variables Summary
e following section is to be
used as a brief reference to the
variables associated with typical
honeycomb vent assembly design.
For more in-depth information,
please reference the additional
information provided as this
guide progresses.
Airow
Airow performance is inversely
proportional to attenuation
performance. Innite metal
results in innite shielding but
no airow, and vice versa.
ree major factors should be
considered when determining
airow performance. Listed
in order of typical impact on
performance are the following:
1.
As cell size decreases, airow
performance decreases.
2. As honeycomb thickness
increases, greater air turbulence
occurs within cells, resulting in
decreased airow.
3. Additional layers of value-added
features (foam lters, etc.) will
decrease airow.
Because of the intimate
relationship between attenuation
and airow, a careful evaluation
and prioritization of technical data
is recommended to ensure optimal
overall performance of the vent
assembly.
Airflow
examples