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The standard honeycomb vent panel is constructed from two layers of aluminium honeycomb set at 90°to each other and set in an extruded aluminium frame. To achieve optimum RF attenuation the overall cell thickness to cell diameter ratio needs to be 4 : 1. However Kemtron can also offer single layer styles where lower levels of shielding performance versus reduced thickness are required. Fixing points can either be plain thru-holes or inserts. Each vent is supplied with an EMC gasket to ensure effective EMI shielding and grounding. Vents can be RoHS passivated to reduce corrosion and tin or painted finishes are also available options. For harsh environments it is possible to include various styles of kick plate to one face of the honeycomb (this will reduce the air flow but will provide protection for the honeycomb). In addition 30° and 45° honeycomb is available to provide either directional air flow or prevent ingress of dripping water (Airflow is slightly reduced with angl