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John Castle at Nolato PPT

John Castle


EMI screened thin vents

Our high performace EMI Shielded honeycomb ventilation panels are custom manufactured from steel, brass or stainless steel. 

Our high performace EMI Shielded honeycomb ventilation panels are custom manufactured from steel, brass or stainless steel. 

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 and 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 Screened thin vent products


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 Screened thin vent products
Find more information, such as our standard sizes etc, in our catalogue.


Detailed information


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


Frequency Field Type VT (a) Type VT (b1) Type VT (b2)
10KHz H 25 10 10
100KHZ H 45 25 18
1MHz H 58 35 36
1MHz E  >100 93 >100
10MHz E  >100 95 >100
100MHz E  >100 97 95
1GHz P 73 54 45
10GHz 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 0f Fixings-Fixing Type/Size

Where possible please provide a detailed drawing.

Shielding Series Frame Style Vent Media Overall Size Fixings (no.) Fixing Type
VT (a) TV1 05 = Expanded Aluminium xxxx-xxxx xx xx
VT (b) TV2 06 = Woven Aluminium      
  TV3 07 = Expaned Monel      

Example - 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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Material data sheets

These documents contain information on the potential hazards (health, fire, reactivity and environmental) and how to work safely with the chemical product.


Application notes

These mini-guides have been designed to help give a quick overview of the product families, their main advantages, usual applications and points to concider during the design stages of a project.


Product catalogues

Learn more about our extensive range of products.