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Shielding Vent Panels
EMI Shielded Vent Panels
Maximum Attenuation with Minimal Air-Flow Resistance

Metal Textiles EMI shielding vent panels provide maximum attenuation with minimal air-flow resistance. Shielding effectiveness is greater than 80 dB at 10 MHz for chromate finished, single layer honeycomb, and is increased to 105 dB using our cross cell construction. By selecting the appropriate frame style, finish, and gasket type, performance can be custom tuned to meet your shielding requirements, and your budget constraints.

Shielded vent panels are constructed of aluminum alloy honeycomb, with a perimeter frame of aluminum extrusion for mounting and gasket application. Various gasket options include wire mesh, spring finger, or conductive fabrics.

Honeycomb Shielding Vent Panels
Aluminum: The standard structure is 1/8" cell adhesive bonded honeycomb, available in 1/2" or 1/4" thickness. Steel and Brass honeycomb shields are available on a custom basis.
Shielded Mesh Screens
Shielded Mesh Screens replace honeycomb media with several layers of woven wire mesh. They are designed for use on shielded electronic enclosures which require filtered air. Mesh screens are easily removable for cleaning.
Framing Options
Standard frame material is extruded aluminum 6063 T-4 alloy. Various C-frame cross sectional configurations are shown on page 2. Many other sizes and styles are available. EMI gasket options include wire mesh and elastomer, groove mounted wire mesh, spring finger gaskets, Metal Textiles oriented wire or Metal Textiles CF conductive fabric over foam gaskets.
Panels are typically mounted to an enclosure using captive threaded inserts, and threaded fasteners.
Shielding Vent Panel Effectiveness
Depending on their size, type of material, finish and gasket type used, shielding vent panels vary in effectiveness. As an example, a 12" square, tin plated aluminum vent panel with a wire mesh gasket, will provide greater than 90 dB of attenuation, at 1 GHz plane wave. Metal Textiles can provide shielding effectiveness data for your specific vent panel design.
EMI Vent Panel Construction

The cross sections shown to the left depict the construction of the basic Cchannel vent panel, with examples of the material codes from the materials table. Many other frame styles and materials are available. Consult a Metal Textiles Shielding Applications Engineer for design assistance.

Standard gasket construction consists of knitted monel wire mesh, bonded to a neoprene sponge gasket. For other gasket materials, please consult a Metal Textiles Shielding Sales Engineer.

Vent Panels
Digit   Frame   Filter   Finish (F)   Fastener
1   3/8" aluminum C channel   1/16" cell single layer, aluminum H/C   Mil-C-5541 iridite   None
.204 D through hole
2   1/2" aluminum C channel   1/16" cell double layer, aluminum H/C   Mil-T-10727 type 1 tin   6-32 threaded captive insert
3   Flush mount aluminum   1/8" cell single layer, aluminum H/C   Electroless nickel   9-32 threaded captive insert
4   ————   1/8" cell double layer, aluminum H/C   ————   M-4 threaded captive fastener
5   ————   1/8" cell, 60 degree single layer alum. H/C   ————   ————
6   ————   1/8" cell, 60 and 90 degree double layer alum. H/C   ————   ————
Airspeed vs.Airflow Resistance
Resistance to air flow is extremely low in all panel designs, although varying from style to style. In particular, airflow resistance with steel and brass honeycomb is approximately double that of aluminum honeycomb. Airspeed vs. airflow resistance is charted for typical vent panels below.

When the outer honeycomb is slanted at 60° from horizontal intake axis than at 30°, an increase to the resistance to airflow will occur.

Cross Sections
Shielding Vent Panels
1/8" cell, single layer H/C with 8-32 captive fastener.
Shielding Vent Panels
1/8" cell, double layer H/C with .204D through hole (not shown).
Shielding Vent Panels
1/8" cell, single layer H/C with .204D through hole (not shown).
  • Maximum Shielding with minimum pressure drop
  • Lightweight aluminum honeycomb
  • Many mounting styles and gasket options to suit your application
  • Custom designs available
  • No polarization effects
  • Panel frames fully gasketed
  • All honeycomb panels can be mounted in circular frames
  • Ready to install
Frame Dimensions (inches)
Part Number*     Vent
   A    B    C    D    E    F    G    H
706-2XXX-9903-03   3X3   4.00   4.00   1.75          
706-2XXX-9903-05   3X5   4.00   6.00   1.75   1.00       1   3.50
706-2XXX-9903-11   3X11   4.00   12.00   1.75   1.25       3   3.00
706-2XXX-9904-04   4X4   5.00   5.00   2.25   0.75       1   3.00
706-2XXX-9904-09   4X9   5.00   10.00   2.25   1.25       2   3.50
706-2XXX-9905-05   5X5   6.00   6.00   1.00   1.00   1   3.50   1   3.50
706-2XXX-9905-11   5X11   6.00   12.00   1.00   1.25   1   3.50   3   3.00
706-2XXX-9906-06   6X6   7.00   7.00   1.50   1.50   1   3.50   1   3.50
706-2XXX-9906-09   6X9   7.00   10.00   1.50   1.25   1   3.50   2   3.50
706-2XXX-9907-14   7X14   8.00   15.00   0.75   0.75   2   3.00   4   3.25
706-2XXX-9909-09   9X9   10.00   10.00   1.25   1.25   2   3.50   2   3.50
706-2XXX-9911-11   11X11   12.00   12.00   1.25   1.25   3   3.00   3   3.00
706-2XXX-9914-14   14X14   15.00   15.00   1.25   1.25   4   3.00   4   3.00
706-2XXX-9918-18   18X18   19.00   19.00   1.75   1.75   5   3.00   5   3.00
* Specify 23F3, 24F1, or 13F1 from cross sections shown on page 2 (left).
Specify "F" as 1, 2 or 3 for Finish
This is only a small listing of possible sizes, shapes and combinations.
For other sizes and materials, please contact Metal Textiles Shielding Sales Engineering at 732-287-0800.

  • Shielding for Containment- To prevent escape of most or all of the interference generated by a particular device, circuit or system as a disturbing source
  • Shielding for Exclusion- To prevent the intrusion of anticipated or known levels of interference on the performance of a specific device, circuit or system
  • Exclusion/Containment Shielding Plus Pressure Sealing- To provide pressure containment as well as EMI/RFI attenuation
  • Grounding and Contacting- Not to contain or exclude but to conduct electrical current such as discharging electrostatic energy from imperfectly grounded structures to ground, providing a dependable, low impedance connection between removable circuit assemblies and the host circuit ground plane and/or power busses, thus ensuring good contact between large or massive electrical structures that do not mate mechanically due to dimensional tolerance

In all of these applications, the solution is found in the use of highly resilient, high-conductive shielding materials.

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