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MODX Revolution

EMI Shielded Thin Vents | Attenuated Vents

General Information

Our thin shielded vent panels are effectively slimmer versions of the EMI shielded airfilters but with different filtration media. The thin EMI Shielding vents are available in two basic types referred to as A & B for ease of reference.

Thin Vent A panels incorporate an expanded aluminium mesh which is crimped into an aluminium extrusion frame.  The Thin Vent A style offers excellent dust filtration and EMI shielding performance but considerably restricted airflow.

Thin Vent B panels incorporate a woven aluminium or expanded Monel foil crimped into an extruded aluminium frame.


EMI shielded thin vent panels are designed for enclosures or racks where RF attenuation and protection from the ingress of foreign bodies is required but space is at a premium.

The type A expanded aluminium mesh panels are nominally 6.0mm thick inside a 4.8mm thick frame and provide attenuation levels considerably higher than the type B woven aluminium and expanded Monel foil types which have a very small effect on airflow but offer less shielding effectiveness. 

All three shielding materials have very different properties and their airflow characteristics are a function of size, positioning, application and airflow source / volume.  We suggest that a sample of the materials is requested for customer testing before specifications are finalised - please ask our sales office.

EMI Shielded Thin Vents | Attenuated Vents


For gasket material specifications please refer to the knitted mesh gasketsconductively loaded silicone and oriented wires in silicone pages.


FrequencyFieldType VT(A)Type VT(B1)Type VT(B2)
10 KHz H 25 10 10
100 KHZ H 45 25 18
1 MHz H 58 35 36
1 MHz E >100 93 >100
10 MHz E >100 95 >100
100 MHz E >100 97 95
1 GHz P 73 54 45
10 GHz P 54 18 18


VT(A) media is expanded aluminium mesh

VT(B1) media is woven aluminium 0.5mm @ 16 OPI (openings per inch)

VT(B2) media is expanded Monel mesh 0.5mm @ 12 OPI


Overall dimensions ± 0.8mm
Fixing holes/fasteners ± 0.5mm
  with jigs ± 0.2mm

How to order

Specify: Shielding Series-Frame Style- Vent Media-Overall Size-Number of fixings-Fixing Type/Size
Where possible please provide a detailed drawing.

Shielding SeriesFrame StyleFilter MediaOverall SizeFixings (No.)Fixing Type
VT(A) TV1 05=Expanded aluminium xxxx-xxxx xx xx
 VT(B) TV2 06=Woven aluminium      
  TV3 07=Expanded Monel      

Examples / Notes

VT(A)-TV2-05-2320-2320-12-T/H(M4) specifies a thin vent utilising expanded and crimped aluminium alloy media within a TV2 frame with 12 size M4 through fixing holes.  The gasket should be specified as shown in the gasket materials sections of the website & catalogue.
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