A range of attenuation vents utilising mainly aluminium honeycomb (brass and steel also available) which is mounted in an aluminium extruded frame. Heavy duty tin-plated or galvanised steel vents are also available for military or industrial applications. These are used wherever an enclosure requires either fan assisted or convection airflow for cooling. Also available in the range are dust filter panels and slimline versions, all of which can be supplied with an EMC gasket for a “ready to fit” format.