global solutions : local support EMI Capabilities

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1 global solutions : local support EMI Capabilities

2 Laird Technologies is the world-leader in the design and supply of customized performance-critical products for wireless and other advanced electronic applications. Laird Technologies partners with its customers to help find solutions for applications in various industries such as: Network Equipment Telecommunications Data Communications Automotive Electronics Computers Aerospace Military Medical Equipment Consumer Electronics Laird Technologies offers its customers unique product solutions, dedication to research and development and a seamless network of manufacturing and customer support facilities located all across the globe. global solutions : local support 1

3 TABLE OF CONTENTS Company Philosophy...page 1 Introduction...pages 3-4 Markets...pages 5 & 8 PRODUCTS Elastomer Core Mesh...page 6 ElectroAir Air Filters...page 6 Electro-Con Oriented Wire...page 6 ElectroNit All Mesh...page 6 ElectroSeal Electrically Conductive Elastomers...page 6 ElectroVent Vent Panels...page 6 Fabric-Over-Foam Profiles...page 6 Fingerstock...page 7 Form-In-Place...page 7 I/O Backplane Shields...page 7 Microwave Absorbers...page 7 PC Board Level Shields...page 7 Tape...page 7 UltraFlex Copper Beryllium (CuBe) Mesh...page 7 UltraSoft Knit...page 7 KEY PRODUCTS Recyclable Clean Copper Fingerstock...page 9 Board Level Shielding...page 9 Conductive Elastomers...page 10 Fabric-Over-Foam...page 10 Form-In-Place...page 11 Microwave Absorbers...page 11 Wire Mesh Gaskets...page 11 Address Locations...page 12 IMPORTANT SHIELDING SELECTION CONSIDERATIONS Consider these important factors when selecting the appropriate shielding products for your design: Attenuation Performance Commercial or Military Worldwide Compliance Corrosive Considerations Cost Cycle Life Electrical Requirements Fastening/Mounting Methods Load/Forces Materials Compatibility Materials Thickness/Alloy Nuclear, Biological, Chemical (NBC) Operating Environment Operating Frequency Product Safety Recyclability Shielding/Grounding/Other Space/Weight Considerations Storage Environment Technical Leadership Manufacturing Superiority Unmatched Global Presence Unrivaled Product Line 2

global solutions : local support FEATURES/BENEFITS Product Highlights ELECTRICAL SHIELDING EFFECTIVENESS Transfer Impedance (500 MHz) H-field (200 KHz) Mil 285 Plane Wave (2 GHz) Mil 285 Surface

Availability Temperature Range Available Profiles Mounting Methods Custom Shapes Available ENVIRONMENTAL Fluid Seal Air/Dust Galvanic Compatibility High recovery - 95% at 50% deflection Variety of

0 (25,4 x 25,4) Round: 0.098-1.00 (2,49-25,4) dia 20-50% Deflection 25-70 Ibs/ft. @30% Deflection 20% @ 50% Compression 0.030-0.

Wire: CuBe, aluminum, monel, tin plated steel -103-500 o F (-75-260 o C) Round, rectangular, single fin, double round with fin Groove, pressure sensitive adhesive, channel mount Yes Elastomer Core

removal Wide variety of standard sizes and mounting configurations Provides cooling of electronic enclosures while containing EMI and preventing microscopic dust particles from entering sensitive

500 (4,75-12,7) Thick Gasket material: Monel and monel with elastomer; CuBe fingerstock aluminum filter media, grille, and mounting frame Captive fasteners, through holes Available with foam filter

seal Available in sponge or solid silicone with monel or aluminum wire Can be die cut in complex shapes Monel wire bonded into the silicone provides multiple spring effect with each contact point

015 (0,13-0,38) Elastomer: silicone - solid or sponge Wire: monel, aluminum 80-500 o F (26-260 o C) Rectangular, strip, flat sheets, die cut shapes Groove, pressure sensitive adhesive Complex die cut

for low cycling applications High shielding effectiveness over a broad frequency range Available in a wide variety of sizes and shapes Knit construction provides long lasting resiliency Versatile

(8,8-74 Kg/m) round 10% @ 20% Compression 0.010-0.

with fin, double round with fin Groove, pressure sensitive adhesive, mechanical fasteners, channel mount Cut to length, mitered corners, flat tape and EMI washers Enviroseal product only: moisture,

Provides both EMI and environmental sealing Extruded shapes ideal for extremely narrow mounting surfaces Die cut and molded versions available in an infinite array of sizes and shapes Wide variety of

020 (0,51) - 0,125 (3,17) Thick O-strip: 0.040 (1,02) - 0.250 (6,35) dia. O-tubing: 0.090 (2,28) O.D.

005-0.010 (0,13-0,25) Tubing: 0.005-0.030 (0,13-0,76) Compounds to meet MIL-G-83528 Elastomer: Silicone, fluorosilicone, EPDM, fluorocarbon Fillers: Ag, Ag/Cu, Ag/AI, Ag/Ni, Ag/GI, CAR, Ni/Graphite.

Hollow extrusions: square, round, D, P Modified standards, cut to length Groove, pressure sensitive adhesive, channel clip on, mechanical fastening Infinite extruded shapes and complex die cuts and

7 global solutions : local support FEATURES/BENEFITS Product Highlights ELECTRICAL SHIELDING EFFECTIVENESS Transfer Impedance (500 MHz) H-field (200 KHz) Mil 285 Plane Wave (2 GHz) Mil 285 Surface Resistivity Volume Resistivity MECHANICAL Available Size Range Deflection Operating Range Compression Force (based on shape selection) Compression Set Joint Unevenness Accommodation Compound/Material Availability Temperature Range Available Profiles Mounting Methods Custom Shapes Available ENVIRONMENTAL Fluid Seal Air/Dust Galvanic Compatibility High recovery - 95% at 50% deflection Variety of core materials and wire alloys Groove or pressure sensitive adhesive mounting db db db ohm/cm 2 Rectangular: x (3,18 x 3,18) x 1.0 (25,4 x 25,4) Round: (2,49-25,4) dia 20-50% Deflection Deflection 50% Compression (0,76-2,54) Elastomer: Neoprene and silicone sponge-silicone solid tubing. Wire: CuBe, aluminum, monel, tin plated steel o F ( o C) Round, rectangular, single fin, double round with fin Groove, pressure sensitive adhesive, channel mount Yes Elastomer Core Mesh No Variety of platings and wire to ensure galvanic compatibility with mating surface Extensive service life, built to outlast the equipment it protects Easy installation, quick mounting and removal Wide variety of standard sizes and mounting configurations Provides cooling of electronic enclosures while containing EMI and preventing microscopic dust particles from entering sensitive equipment db db (4,75-12,7) Thick Gasket material: Monel and monel with elastomer; CuBe fingerstock aluminum filter media, grille, and mounting frame Captive fasteners, through holes Available with foam filter media ElectroAir Air Filters Dust filtration with minimal pressure drop Monel gasket material compatible with wide variety of plated surfaces Electro-Con Oriented Wire Provides both EMI and moisture seal Available in sponge or solid silicone with monel or aluminum wire Can be die cut in complex shapes Monel wire bonded into the silicone provides multiple spring effect with each contact point resulting in low compression set db db db ohm-cm (0,81-6,35) Thick 10-20% Deflection PSI ( KPa) 50 PSI (344,5 KPa) (0,13-0,38) Elastomer: silicone - solid or sponge Wire: monel, aluminum o F ( o C) Rectangular, strip, flat sheets, die cut shapes Groove, pressure sensitive adhesive Complex die cut shapes, bonded or vulcanized Moisture and rain Provides barrier against dust Monel and aluminum wire are compatible with a broad range of mating surfaces ElectroNit All Mesh Most economical gasket for low cycling applications High shielding effectiveness over a broad frequency range Available in a wide variety of sizes and shapes Knit construction provides long lasting resiliency Versatile mounting options Available with elastomer gasket for moisture and dust sealing db db db ohm-cm (1,57-12,7) Height 20-40% Deflection From 6-50 Ibs/Iin. ft. (8,8-74 Kg/m) round 20% Compression (0,25-0,76) CuBe, monel, aluminum, tin plated steel, tin plated brass, Enviroseal version with neoprene or silicone Enviroseal o F ( o C) Round, rectangular, square, single round with fin, double round with fin Groove, pressure sensitive adhesive, mechanical fasteners, channel mount Cut to length, mitered corners, flat tape and EMI washers Enviroseal product only: moisture, rain Enviroseal product only Variety of platings to ensure galvanic compatibility with mating surface ElectroSeal Electrically Conductive Elastomers Meets both military and commercial standards Provides both EMI and environmental sealing Extruded shapes ideal for extremely narrow mounting surfaces Die cut and molded versions available in an infinite array of sizes and shapes Wide variety of material compounds for galvanic compatibility to mounting surfaces High corrosion resistant compounds available db db db ohm-cm Sheet: (0,51) - 0,125 (3,17) Thick O-strip: (1,02) (6,35) dia. O-tubing: (2,28) O.D. x (1,27) I.D. to (11,10) O.D. x (6,35) I.D. Sheet: 10% Deflection Solid Extrusions: 10-25% Deflection Hollow Extrusions: 20-50% Deflection Sheet: PSI (516,7-689 kpa) 50% Deflection Sheet: (0,13-0,25) Tubing: (0,13-0,76) Compounds to meet MIL-G Elastomer: Silicone, fluorosilicone, EPDM, fluorocarbon Fillers: Ag, Ag/Cu, Ag/AI, Ag/Ni, Ag/GI, CAR, Ni/Graphite. Available in NASA specified ES75 compounds for outgasing required for space applications o F ( o C) Sheet stock; Solid Extrusion: rectangular, round D and U-channel. Hollow extrusions: square, round, D, P Modified standards, cut to length Groove, pressure sensitive adhesive, channel clip on, mechanical fastening Infinite extruded shapes and complex die cuts and molded parts Moisture, rain, jet fuel and nuclear biological chemical (NBC) UL compounds Excellent sealing against air and dust Over 30 compounds available to ensure galvanic compatibility. High corrosion resistant compounds available ElectroVent Vent Panels Available in a wide range of materials and platings to meet a broad range of shielding effectiveness requirements Varied mounting configurations to meet environmental and space criteria Available with protective grille for protection in high traffic areas Provides cooling of electronic equipment while maintaining EMI integrity of enclosure db db (6,35-12,7) Thick Gasket material: Monel, tin/copper/steel; CuBe fingerstock Frame: Aluminum alloy, steel, brass Honeycomb: Aluminum, steel, brass Captive fasteners, through holes Available in circular configurations and custom shapes Drip proof versions available 95% open area for minimal pressure drop Gasket materials compatible with wide variety of plated surfaces UL 94VO and HB flame retardant Ideal for applications requiring low pressure force Self-terminating cut-to-lengths High conductivity and shielding attenuation Galvanically compatible w/most mating surfaces High abrasion and shear resistance >85 db db db <0.07 ohms/square (0,038-24,0) 20-75% Deflection 3-10 Ibs/ft. (4,5-15,0 20% Deflection (Dependent on foam selection and shape) 50% Deflection (0,51-1,27) Cover: Flame retardant metallized Ni/Cu, Tin/Cu and silver woven or non-woven textile. Core: Flame retardant urethane, TPE o F ( o C) Round, rectangular, square D, C, J, P, U, Clip-on, Knife Edge Groove, PSA, Clip-on, Dart Cut to length, mitered and spliced corners, kiss-cut, other profiles Fabric-Over-Foam Profiles Provides barrier against dust Compatible with a wide variety of mating surfaces such as zinc, aluminum, stainless steel, etc. Large selection of sizes and shapes Wide mechanical operating range Superior performance at elevated temperatures High shielding effectiveness levels Ideal for high cycle applications Good design flexibility with either wiping action or in compression Also available in stainless steel, phosphor bronze and beryllium-free variants db db db Selection of various sizes and configurations to accommodate gaps from (0,25-10,2) 20-80% Deflection UltraSoft 98 Series: 1.6 lbs/iin. ft (2,4 Kg/m) to 41 Ibs/Iin. ft (61 Kg/m) Standard 97 Series: 3.1 Ibs/Iin. ft (4.6 Kg/m) to 118 Ibs/Iin. ft (176 Kg/m) None within operating range (0,08-8,89) maximum Standard product copper beryllium, also offered in phosphor bronze, stainless steel and beryllium-free variants Continuous 250 o F (121 o C) Over 350 standard shapes available, as well as cut to length and modified standards to include finger removal, notches, holes punched, etc. Clip-On, Sticky Fingers (pressure sensitive adhesive tape), rivet, weld, solder, and slot mount Custom designs to meet specific applications None Fingerstock Limited to twist series with Poron seal Over 20 plating finishes available to ensure galvanic compatibility with mating surface Small consistent bead can be applied to thin walls, saving labor and eliminating material waste Soft compressible materials Effective alternative to traditional application of gaskets Automated process capable of irregular shapes and tight tolerances Dispense on metal or plastic db db db ohm-cm Height: (0,36-2,3) Wide: (0,38-3,1) 15-20% Deflection 1.5 Ibs/Iin. (0, (0,56) 20% Deflection 50% Deflection (0,05-0,15) Elastomer Silicone fillers: Ag/AI, Ag/Cu, Ag/Glass, Ag/Ni, Ni, Ni/Graphite o F ( o C) D Shape Bead Directly applied to mounting surface Infinite variety of patterns Larger custom bead sizes Moisture, rain seal Form-In-Place In limited applications Available in four compounds to provide galvanic compatibility with most mating materials UL 94VO & HB flame retardant Lightweight construction ideal for backplane grounding/shielding High conductivity and shielding attenuation Can be manufactured in a variety of thicknesses with specific die-cut holes/shapes Galvanic protection with most metallic surfaces >85 db db db <0.07 ohms/square (0,38-11,20) 20-50% Deflection 3-10 Ibs/ft. (4,5-15,0 20% Deflection (Dependent on foam selection and shapes) 50% Deflection (0,254-0,762) Cover: Flame retardant metallized Ni/Cu, Tin/Cu and silver woven or non-woven textile. Core: Flame retardant urethane, TPE o F ( o C) Rectangular and square Pressure sensitive adhesive Intricate die cuts; cut-to-length and kiss-cut parts I/O Backplane Shields Provides barrier against dust Compatible with a wide variety of mating surfaces such as zinc, aluminum, stainless steel, etc. Can be used at higher frequencies than traditional shielding Can be used with other shielding to extend frequency range Variety of types for custom solutions Easy installation with pressure sensitive adhesive into noisy cavities Can be used for reducing both EMI and radar cross section Internal EMI reduction, cavity resonance reduction, used in conjunction with board level shielding Offered in 24 x 24 (609,6 x 609,6) sheets, as a die-cut or kiss-cut component Microwave Absorbers Microwave Absorbing Elastomers (Q-Zorb) are offered in silicone, nitrile, natural rubber, urethane, Viton, neoprene, Hypalon and fluorosilicone. Microwave Absorber Foam is an urethane based open celled foam Q-Zorb o F ( o C) RF Foam o F ( o C) Q-Zorb Thicknesses (0,25-9,53) RF Foam Thicknesses (3,18-114,3) Pressure sensitive adhesive Infinite die cut shapes and molded parts Moisture, rain, jet fuel, nuclear biological chemical (NBC), UL, compounds Available in limited applications Many compounds available for galvanic and environmental compatibility Custom shapes available Provides isolation of board level components Minimizes crosstalk and susceptibility without impacting system speed Available in tape or reel for automated pick and place applications Removable lid for component access Also available in EZ Peel TM removable lid style one-piece construction - 48 db db Fence and lid: (3.3-25,4) Height (152,4) Width. One piece construction: (1,0-6,4) Height (6,35-9,53) Width Tin plated phosphor bronze, tin coated steel, stainless steel, brass, CuBe, and nickel silver. Other materials also available. Withstands reflow and solder temperature Squares, rectangles, L-shapes, 90 o inside corners and other custom shapes. Surface mount/through hole, various pin styles available Flexible fence with flat lid, photo etched flat blanks for hand forming, solid can construction, supplied with dividers to provide isolation Compatible with all solder materials Hollow knit design eliminates the need for potentially moisture-absorbent core High cycle life for high traffic applications with no resulting compression set 100% recovery at 75% deflection Compression force 80% less than conventional mesh gasket db db db ohm/cm (1,52-12,7) Height 25-75% Deflection From 5-25 Ibs/ft. 30% Deflection - hollow core round 75% Compression (0,76-10,16) CuBe, aluminum, stainless steel wire in various diameters, single or multi strand construction. Continuous 250 o F (121 o C) Round, D shape, round with fin, double round with fin Groove, pressure sensitive adhesive, mechanical fasteners, channel mount Cut to length, diameters other than standard, D-shapes and fins other than standard UltraFlex Copper Beryllium (CuBe) Mesh Variety of platings to ensure galvanic compatibility with mating surfaces Smooth surface provides outstanding appearance Fray free ends High cycle life Low closure force Low compression set Flame retardant core (UL 94) High shielding attenuation Available with GalvaGuard corrosive protection coating db db db (silver) ohm/cm (3,17-10,46) 20-50% Deflection 7-15 Ibs/ft. (3,18-6,81 30% Compression 50% Deflection (0,254-0,762) Yarn: Silver nylon Core: UL 94 HF-1 Polyurethane Core o F ( o C) Round, rectangular, square, D profile, C fold Groove, pressure sensitive adhesive Cut to length, mitered and spliced corners, other profiles available UltraSoft Knit Provides barrier against dust Compatible with a wide variety of mating surfaces Mounted on the air intake port, air filters provide To provide both EMI shielding and an environmental Covers opened infrequently for servicing Provides air flow for component cooling and a Shielding or grounding of computer and Ideal for high cycling applications which require Ideal in applications with miniature electrical Connector gasket used to shield and/or ground the Antenna sidelobe reduction All applications requiring shielding of board level Flexibility of design provides grounding and High traffic door opening/closing with minimum Smooth surface provides outstanding Large cabinet doors - minimal force, good EMI and environmental sealing applications where heat dissipation and dust filtration for small seal on cast or machined surfaces. Vulcanized (6-12 times per year) barrier to reduce RF leakage. In sizes ranging from telecommunication equipment seams and apertures frequent access housings with thin wall construction and intricate backplane of computer and telecommunications Surface current suppression components shielding solutions for I/O shielding panels, disk compression set appearance and safe handling for applications APPLICATIONS recovery flat or groove mounting surface requires a complex enclosures, large housings, and clean room frame configurations can be used with pre-cast Long lasting resiliency is ideal for highly small muffin fans on desk tops to large room size Good in wiping applications, when gasket needs multi components; i.e., cell phones, hand held equipment which have a variety of cut-outs and Applied directly to the top of high speed CPU, LSI Low height down to 0.04 (1,0) to accommodate drives insulators, ground planes or circuit boards, Thin sheet metal doors with minimum latch points requiring frequent access molded or extruded shape. Infinite array of shapes Typical Applications Hinged access openings with minimal latching facilities housings, vent panels, and computer terminal sensitive components in permanent or facilities. Available in commercial and military to be engaged from either the top or side devices, electromedical devices. openings. Standard D-Connectors, RJ45, SCSI, USB, and Ics mother/daughter board configurations electromedical devices, keyboard devices Low compression force for applications that Available in pre-cut packaged kits for labor force provide flexibility of profile designs down to window frames. Die-cut wall widths as low as semi-permanent enclosures grade materials IEEE 1394 and ATX versions available include backplanes, computer chasis, and access saving time for Shielding Gaskets Wide variety of profiles and mounting methods Suppresses crosstalk Secure cover design ideal for applications that could Mask and peel tape for painted electronic (0,51) diameter to accommodate miniature paging (2,27) wide. Some examples include circular Consistent point to point contact for high to accommodate applications from small hand Improves antenna gain in RFID applications be subject to shock & vibration such as mobile military enclosures covers requiring superb resiliency units and other small hand held devices military connectors and sub D-connectors shielding effectiveness over the life of the gasket held devices to roomsize enclosures Radar cross section reduction vehicles, commercial aircraft, & wireless electronics Cable and wire harness wrapping EZ Peel provides access to shielding components 6 All dimensions shown are in inches (millimeters) unless otherwise specified 7 PC Board Level Shields Simple installation Ideally suited for thin or low profile applications Conductive foil tape with release mask for painted enclosures Tinned copper cloth and nickel copper cloth versions provide an easy to handle alternative to foils db Low surface resistivity based on material selection (6,4-50,8) Width (0,08-0,18) Thick Tin plated copper, copper foil, nickel copper cloth tape o F ( o C) based on material selection Rolls Pressure sensitive adhesive, conductive or nonconductive Die cut shapes Tape Wide variety of materials available to meet galvanic compatibility requirements

CONDUCTIVE ELASTOMERS Electrically conductive elastomers provide environmental sealing and excellent mechanical and electromagnetic shielding properties.

Laird Technologies offers a wide variety of conductive filler materials in extruded, molded die-cut, dispensed Form-In-Place, printed and coated formats.

10 CONDUCTIVE ELASTOMERS Electrically conductive elastomers provide environmental sealing and excellent mechanical and electromagnetic shielding properties. Conductive elastomers are ideal for applications that demand both environmental sealing and EMI shielding, and can be used in a broad range of applications. Laird Technologies offers a wide variety of conductive filler materials in extruded, molded die-cut, dispensed Form-In-Place, printed and coated formats. Die-cut and molded versions available in an infinite array of sizes and shapes Extruded shapes ideal for extremely narrow mounting surfaces Conductive elastomers are available with multiple attachment methods for use in rigorous environments Provides both EMI and environmental sealing Wide variety of material compounds for galvanic compatibility to mounting surfaces FABRIC-OVER-FOAM GASKETS Laird Technologies has a comprehensive Fabric-Over-Foam gaskets product line consisting of Fabric-Over-Foam shielding gaskets, conductive fabric and conductive tape. Fabric-Over-Foam gaskets: Galvanically compatible with most mating surfaces High abrasion and shear resistance High conductivity and shielding attenuation Ideal for applications requiring low pressure force Self-terminating cut-to-lengths UL 94V0 and HB flame retardant Conductive fabric combines highly conductive metals with lightweight fabric to meet a diverse range of EMI/RFI shielding requirements. Conductive tape offers excellent conductivity, conformability and durability in a thin, lightweight and flexible shielding design. 10

FORM-IN-PLACE Form-In-Place is an automated system for dispensing conductive elastomer EMI shielding and grounding gaskets onto metal or plastic substrates.

Automated process capable of irregular shapes and tight tolerances Dispense on metal or plastic Effective alternative to traditional application of gaskets Small consistent bead can be applied to

magnetic properties have been altered to allow absorption of microwave energy at discrete or broadband frequencies.

11 FORM-IN-PLACE Form-In-Place is an automated system for dispensing conductive elastomer EMI shielding and grounding gaskets onto metal or plastic substrates. This product is particularly ideal for mobile phones, PDAs, PC cards, cellular base stations, radios and many other compartmentalized cast or plastic enclosures and packaged electronic assemblies. Automated process capable of irregular shapes and tight tolerances Dispense on metal or plastic Effective alternative to traditional application of gaskets Small consistent bead can be applied to thin walls, saving labor while eliminating material waste Soft compressible materials MICROWAVE ABSORBERS As the name implies, microwave absorbing materials are coatings whose electrical and/or magnetic properties have been altered to allow absorption of microwave energy at discrete or broadband frequencies. Laird Technologies offers a wide range of microwave absorber products including die-cut elastomers, foam, thermoplastics and custom solutions to aid in a variety of problems such as internal cavity resonances, antenna pattern shaping and high frequency interference. Can be used at higher frequencies than traditional shielding Can be used for reducing both EMI and radar cross section Can be used with other shielding to extend frequency range Easy installation with pressure sensitive adhesive into noisy cavities Internal EMI reduction, cavity resonance reduction, used in conjunction with board level shielding. Variety of types for custom solutions WIRE MESH GASKETS Wire mesh gaskets are a very versatile and proven style of shielding. Wire mesh gaskets have a great variety of uses and there are several popular types to choose from depending on shielding or environmental requirements. Knitted gaskets can be made from a variety of metal wires, including monel, tin plated copper clad steel or aluminum. Cost effective for low cycling applications High shielding effectiveness over a broad frequency range Available in a wide variety of sizes and shapes Knit construction provides long lasting resiliency Versatile mounting options Available with elastomer gasket for moisture and dust sealing OTHER LEADING EMI PRODUCTS Backplane Shields Elastomer Core Mesh ElectroAir Air Filters ElectroNit All Mesh ElectroSeal Electrically Conductive Elastomers ElectroVent Panels Electro-Con Oriented Wire Tapes 11

20. HONEYCOMB VENT PANEL

20. HONEYCOMB VENT PANEL FilterS. GENERAL INFORMATION Euro Technologies offers EMI Shielding Ventilation Panels. Available in a wide choice of materials, platings, and mounting configurations, it offers