HONYLITE specializes in the production of electromagnetic shielding products. The honeycomb vent is series of tubes that acts as a waveguide, guiding electromagnetic waves into or out of the enclosure, but as the tubes are long enough then it attenuates those waves. Typically the tube should be at least 3 times as long as the diameter. Good practice is 4 times. Therefore a 3.2mm cell should be 12.7mm long. Honeycomb material is used because it offers high shielding performance, light weight and good airflow.