this invention relates to the field of sound control equipment , and particularly to an acoustical panel for absorbing sound generated by equipment in a sterile environment such as a clean room , kitchen , food processing plant or drug manufacturing facility . the acoustical panel is comprised of an inner core made of loosely woven fibrous material , at least one middle layer on at least one side of the inner core which enhances durability without significantly reducing the sound absorption characteristics of the inner core ; edge support means ; and an outer layer fabricated of a durable plastic material capable of being heat shrunk .