EMI/RFI Shielded Air Filtration Panels Shielded air filters are used to filter the intake air of electronic equipment enclosures where EMI/RFI shielding is also a criteria. High-efficiency air filters are supplied ready to install with an EMI/RFI gasket as an integral part of the filter assembly. The rigidity of the mounting frame makes installation and removal for cleaning an easy task. The filter media used in the panels can be supplied as a dry or wet filter. Impingement of fine dust particles on filters with a glutinous oil coating is greatly enhanced.
Installation of the air filter into the electronic enclosure provides an effective dust filter with minimal resistance to air flow while simultaneously providing attenuation of electromagnetic interference.
A broad selection of shield air filter media sizes provides the widest choice in design objectives.
EMI/RFI shielded air filters are supplied with EMI/RFI gasket and mounting holes or captive fasteners - ready for installation into cabinet.
Many applications require a special shape or mounting configuration. Special designs are available.
Air filter panels mounted on the outside of cabinet can be supplied with the exposed surfaces painted to meet the Military Standard color of the cabinet. |
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EMI/RFI Shielded Ventilation Panels A line of ready-to-install honeycomb cooling vents provide optimum EMI/RFI shielding with minimum pressure drop for ventilating air. Shielding effectiveness is accomplished using waveguide design principles.
The choice of the shielded honeycomb that best meets design considerations is based on three main criteria: Shielding, Air Flow and Mounting. For most applications, aluminum Code-32 honeycomb (properly installed using mounting frame with integral EMI/RFI gasket) will provide a degree of attenuation that will be within specification limits. However for the lower frequency range (H-field) it may be necessary to specify material Steel Code-44. Although heavier in weight than aluminum, an increase of 20-40dB H-field shielding effectiveness can be achieved in the lower frequency range by the use of the higher permeable-44 grade.
Common sides and mounting configurations are available. In all cases, the EMI gasket is supplied as an integral part of the vent assembly. Mounting of the vent to a shielded enclosure is accomplished through holes supplied in the panel or captive fasteners located and installed to specific dimensions so as to be ready for installation into the cabinet.
Vents mounted on the outside of cabinet can be supplied with exposed surfaces painted to meet the Military Standard color of the cabinet.
Installation of the honeycomb with its 4:1 opening to depth ratio - provides the waveguide below cut-off effect required to attenuate EMI/RFI interference while not impeding the air flow required to cool the packaged enclosure.
A broad selection of sides provides the widest choice in meeting design objectives. We can also assist with special mounting and/or shapes. |
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Fan Ventilation Panels
Fan ventilation panels are manufactured to meet the commercial market's requirements for a low-cost, high-quality EMI-shielded ventilation panel. These units are available in five standard sizes using a 0.250" thick honeycomb material and have an overall thickness with gasket of 0.407". Standard gasket is a Monel wire embedded in a solid silicone with an optional gasket of a Beryllium copper fingerstock. Standard finish is Chromate conversion with a tin plate (MIL-T-10727) or a nickel plate (MIL-C-26074A) available upon request.
Shielding effectiveness is in the 50-60 dB range at 1 GHz, depending on the gasket material used. Standard lead times are in the two-to-three week range for most sizes with quicker deliveries available based on plating and quantities required.
