The ARSCLP-2 2U Security Cover with Large Perforations from Odyssey Innovative Designs is a panel designed to fill empty space between your components while promoting air flow with its perforated surface. Although the large openings promote airflow, they are still small enough to prevent dust and other foreign debris from readily entering your enclosure.This panel can be secured on the back side of your rackrails to prevent unauthorized tampering or removal, thereby providing an additional layer..