Aluminium honeycomb fan shield with threaded holes

A range of low-cost EMC vents for use with standard fan size fans. The aluminium honeycomb fan shield 9535 series is designed to provide EMI shielding and maximum airflow without degrading the fan output.

These vents provide a low-cost option to perforated metal when airflow rates are critical. An aluminium frame is fitted with one layer of 6.35, 12.7 or 25.3 mm thick honeycomb material and an optional Amucor conductive gasket to ground the honeycomb to the metalwork.

Holland Shielding Systems B.V. stocks aluminium Honeycomb Fan Shield in almost all sizes corresponding to industry-standard fans with standard 4-hole mounting (See table below for the standard sizes).

Dust screen (on request)

Dust screens consisting of multilayer expanded aluminium can be added, but airflow will be restricted.

Shielding performance

Shielding performance is achieved from 1/8 cell aluminium honeycomb panels with compressed edges mounted in a square-shaped flat Mu-ferro plate with a circular cut-out on the inside. The contact with the housing is made with an amucor shielding gasket cut into the correct shape of the Honeycomb fan shield.

Performance below has been measured with honeycomb specifications 1/8 Cell size, 1/4 Thick.

FrequencyFieldTypical (dB)
200 kHzH53
100 MHzE102
500 MHzP85
2 GHzP74
10 GHzP58

Standard dimensions

In the table below some common types are specified to illustrate the required information. Threaded hole diameter is standard M3 but it can also be delivered in any other size.

Material thickness

Part numberOuter dimensionMounting holes horizontalMounting holes vertical
(Optional) other sizes on request