Aluminium Honeycomb Vent Panels
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Aluminium Honeycomb Air Ventilation Panels for RFI/EMI Shielding Product Overview Aluminium Honeycomb Air Ventilation Panels consist of an aluminium honeycomb foil held in a rigid extruded aluminium mounting frame. The foil, formed and laminated into a series of honeycomb cells that are glued and perforated or laser welded at the join, ensures a conductive path at each join. Although the foil is conductive in all directions, to enhance EMI performance, two pieces of honeycomb polarised at 90º to each other are recommended. The frame can be supplied with an integral or separate EMI/RFI gasket, and can be treated with a variety of finishes to provide corrosion protection or improve conductivity. How do Honeycomb vents work: The principle is that of “Waveguide beyond cutoff. The honeycomb vent is series of tubes that acts as a waveguide, guiding electromagnetic waves into or out of the enclosure, but as the tubes are long enough then it attenuates those waves. Typically the tube should be at least 3 times as long as the diameter. Good practice is 4 times. Therefore a 3.18mm cell should be 12.7mm long.Honeycomb material is used because it offers high shielding performance, light weight and good airflow. A standard range of Honeycomb vents are available, drawings and part numbers are shown at the end of this data sheet. 19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E info@kemtron.co.uk, www.kemtron.co.uk

Aluminium Honeycomb Air Ventilation Panels for RFI/EMI Shielding Product Overview (Continued) Applications Ventilation panels are designed for use in electronic enclosures where good air flow is required for cooling and ventilation but where EMC compliance must be ensured. Typical applications are: • Electronic Enclosures. • Air Conditioning Units. • Fan housings. • EMC Racks. • Communication shelters. Availability An extensive range of aluminium extrusion mounting frames are available from stock offering a choice of mounting methods and sizes. Available as custom sizes with no additional...

Aluminium Honeycomb Air Ventilation Panels for RFI/EMI Shielding Product Overview (Continued) Honeycomb specification and availability: Kemtron uses 5052 grade aluminium foil which is a lightweight material offering superior strength and corrosion resistance over commercial grade aluminium foils. It meets all the requirements of MIL-C-7438. Kemtron’s standard honeycomb vent uses 2 layers of 1 /8” cell X ¼” thick laid at 90°, this is known as cross cell. Cross cell honeycomb improves shielding performance by eliminating any polarizing effects. Standard straight cell sizes & thicknesses held...

Aluminium Honeycomb Air Ventilation Panels for RFI/EMI Shielding Product Overview (Continued) Frame styles available Frame styles 1701,1702,1703,1704 and 1707 will accommodate 2 layers of 3.2 x 6.35mm thick honeycomb, one layer of 3.2mm cell x 6.35mm thick and one layer of 3.2mm x 6.35mm thick angled honeycomb or one layer 12.7mm thick honeycomb Notched corner Frame styles 1705 and 1706 will accommodate 1 layer of 3.2 or 1.6mm cell x 6.35mm thick honeycomb. Also possible to accommodate 2 layers of 3.2mm cell x 3.2mm thick honeycomb Frame style 1709 main use is for dust filter panels that...

Aluminium Honeycomb Air Ventilation Panels for RFI/EMI Shielding Product Overview (Continued) Finishes Vent panels can be supplied with a range of finishes including: • Painted. • Tin or nickel plating. • Kempass (RoHS ) Aluminium Passivation process. • Trivalent chromium (RoHS compliant) or Hexavalent chromium. Kemtron’s standard finish (Kempass) for aluminium vent panels fully meets the RoHS directive and replaces Alocrom1200 which is a hexavalient chromium process. Kemtron’s in-house process applies a permanganate passivation which is a chromate free, inorganic and non toxic coating. The...

Aluminium Honeycomb Air Ventilation Panels for RFI/EMI Shielding Product Overview (Continued) Gaskets for vents • Knitted wire mesh = Frames with a gasket groove. • Orientated wire in silicone. • Knitted Monel wire mesh with a Neoprene sponge carrier 2.4mm thick. • Beryllium Copper finger stock. Kmitted wire mesh with neoprene gasket Other gasket types are available if required Beryllium copper gasket Kick Plates Aluminium honeycomb is fragile so for high traffic areas or where honeycomb damage could easily occur kick plates can be fitted. Two types are stocked as standard, however custom...

Aluminium Honeycomb Air Ventilation Panels for RFI/EMI Shielding Product Overview (Continued) Fan Vents A range of low cost plastic EMC vents for use with 80mm, 92mm & 120mm fans. They provide EMC shielding where applications demand a low cost solution, whilst still providing an adequate shielding performance. A Hi-impact ABS UL94V-0 fire retardant moulding is fitted with one layer of 3.2mm cell x 6.35mm thick honeycomb and a nickel/copper fabric gasket to ground the honeycomb to the metalwork. The vents have 4 countersunk holes to suit standard fan mountings. Measured shielding performance...

Proven EMC Shielding Performance Aluminium Honeycomb RFI/EMI Shielding Product Overview (Continued) Optional Removable Dust Filters and Insect Screen Dust Filter This consists of a aluminium frame 1701, 1705, 1706, 1707 & 1709 which holds a polyester polyurethane dust filter. This is held in place on one side by a stainless steel weld mesh. This frame then mounts on to one side of the honeycomb vent panel by captive screws. Easily removed for cleaning with a mild detergent and rinsed with water. A range of different filter Aluminium honeycomb vent panels fitted with removable dust filters...

Proven EMC Shielding Performance Aluminium Honeycomb RFI/EMI Shielding Product Overview (Continued) Frame Styles 19-21 Finch Drive, Springwood Industrial Estate, Braintree, Essex CM7 2SF, United Kingdom. T +44 (0)1376 348115, F +44 (0)1376 345885, E infoOkemtron.co.uk, www.kemtron.co.uk