Vents, Panels, Screens and Filters Introduction

EMI produce a comprehensive range of Vents, Panels, Screens and Filters that are all primarily designed to allow unrestricted air-flow whilst preventing the transmission of electromagnetic interference (EMI). They are used wherever there is a requirement for air cooling or to allow ventilation without compromising the shielding integrity of an enclosure.

The main types of EMI Filter panels are:


Honeycomb vent panels

The most commonly used type of vent is based on Aluminium honeycomb panels mounted in an extruded Aluminium frame. The honeycomb media has a very high open area and therefore allows good air flow with minimal pressure drop. In order to achieve the best shielding performance two layers of honeycomb are used orientated at 90° to one another, although this is not always necessary on some less demanding applications. The exterior facing honeycomb layer can be angled (usually 45°) so as to direct airflow in a particular direction or to deflect rain or spray. Whilst this can be a useful feature to include in a vent design it should be borne in mind that it will impede airflow, particularly at higher air speeds.


Thin Attenuation Vent Panels

Thin vent panels, or thin screen shields (TSS), are designed for applications where space is limited, and eliminating the use of full size honeycomb vents.


EMI Shielding Dust Filters

Electronic filter and dust shields perform three functions. They attenuate RFI, provide for the passage of cooling air and filter large dust particles from the airflow. They provide maximum dust trapping effectiveness, yet cause reasonably low resistance to air movement.


High performance / EMP vents

There are also some types of vent designed for very high levels of performance and / or more arduous conditions.


Low Cost Fan Vent Panels

They provide EMC shielding where applications demand a low cost solution, whilst still providing an adequate shielding performance. These are available 'off the shelf' for fast delivery and significantly more cost effective if small volume shielding vents are required.

We can also offer a comprehensive range of Air and Fluid filters using a wide range of reticulated sponges and other materials.


For further information on our Vents, Panels and Screens please contact our Relationship Management team at

Full data sheets for all grades are available on request.

* The information above is supplied in good faith and believed to be correct. This information is supplied upon the condition that persons receiving this will make their own determination as to its suitability for their purposes prior to use. EMI makes no representations or warranties, either expressed or implied with respect to the information or the product to which this information refers.