Abstract: An acoustic noise reduction accessory apparatus attachable or made integral to a personal computer or other electronics equipment. The apparatus reduces acoustic noise emitted from the rear of the computer and in particular reduces the acoustic noise from circulating fans. The apparatus comprises an acoustic barrier or shielding member. The barrier is shaped in various forms externally of the computer or integrally extending from the back of the computer around one or more fans of the computer; the acoustic barrier member allows for minimum airflow reduction. Acoustic absorbing material is layered upon the acoustic barrier and may be combined with vibration absorbing material. The barrier may be shaped from solid or flexible members to accommodate different sized electronics and formed to include baffles and structures to direct airflow while absorbing noise; and may be made adjustable by one or more slidable members. The apparatus is easily assembled and collapsible for storage.