When an HVAC systems internal insulation becomes old, broken down, and friable, it may be determined that replacement is necessary. Advanced has a product that can provide a low cost alternative to replacement. By encapsulating the existing internal insulation, a new surface is created that will extend the life of the original lining. An anti-microbial encapsulation will lock in all fibers and particulates embedded in the fiberglass to prevent contamination as well as prevent and treat mold/bacteria growth .