QUIET LINER™ - RECYCLED COTTON ACOUSTICAL LINER Excellent Noise Absortion Class A Fire Rate Reduces Heat Loss/Gain No Formaldehyde Resists Microbial Growth Low Air Resistance No Itch or Skin Irritation Quiet Natural Fiber Liner (Patent Pending) is a thermally bonded HVAC insulation that offers superior acoustic and thermal performance. Made from natural fibers, Quiet Liner contains no fiberglass and does not itch or cause skin irritation. The fibers used to manufacture Quiet Liner offer excellent sound absorption properties. The air stream surface of Quiet Liner is overlaid with a durable, fire-resistant black facing providing additional strength to the product. Both the insulation and the facing are treated with an EPA registered anti-microbial agent.