Abstract: A dust cover for protecting a computer component includes an open bottom enclosure which completely covers the computer component and includes a lower edge having a compressible seal member which engages the resting surface on which the component is situated. The cover can be constructed from a clear acrylic material and can be provided with a notched opening in a rear wall for running electrical power supply cords and related wires therethrough. To provide for sufficient cooling of the enclosed component, an exhaust fan is located in an opening formed in the rear wall of the cover and draws cooling air through a separate replaceable filter element located in an inlet opening provided in the cover. If it is necessary to have access to the component such as the disk drive unit, a sliding access door can be provided at the appropriate location.