EMI Shielded Vents - Attenuation Vents

EMI Shielded Vents - Attenuation Vents Description:

Our VH Series of lightweight aluminium honeycomb attenuating ventilation panels comprise of forms of conductive airflow media retained within an aluminium extrusion. These EMC vents are designed for use in racks and other forms of commercial enclosure.

Our VF Series of RFI vents combine the benefits of an attenuation vent panel with the properties of a dustfilter in a single frame, unlike the VB Series which utilises separate units fixed together in-situ.
Standard frame styles are AF1 to AF4 and they incorporate a triple layer of woven and corrugated aluminium mesh. Each layer has a slightly different degree of corrugation and so provides separation and increased airflow potential. To enable it to perform its dual function the VF filter material is relatively dense and so requires an assisted airflow to operate correctly. A 'kickplate' is built into the unit to protect the filter from damage.

Our VB Series of EMC vents / filter assemblies are composites of the VH Series honeycomb attenuation vents and demountable dustfilter panels containing a demembraned polyurethene filter media. The vent is specified in the normal way and contains, within its mounting frame, additional fixings (usually captive threaded inserts) which are used to retain the framed dustfilter element.
The dustfilter can be mounted either side of the EMC vent panel and attention should be paid when specifying the type of interface gasket to ensure that, where necessary, it is conductive. The filter material is available with openings of 30 to 60 per inch as standard, but others can be specified, and is secured by a woven mesh kickplate.

Our VP Series of honeycomb ventilation panels can be custom manufactured from steel, brass or stainless steel. When selecting the material, corrosion resistance relevant to the application environment should be considered along with the attenuation requirements.
Typical construction styles are shown in drawings VP 1 and VP 2 (other styles are available). Typical attenuation figures for the material types and thickness options are shown below. Both rectangular and circular styles are available. Various plating and gasket options are available and should be discussed at the time of ordering. The VP Series of RFI ventilation panels are manufactured to customer specification and a detailed drawing should be supplied.