The Tough-Gard R is an HVAC rotary-based fiberglass duct liner with a moisture-resistant surface. The product comes with the company's Enhanced Surface, which is 40 percent more moisture resistant than previous generations of the model, officials say. According to the company, the new surface helps to alleviate concerns about moisture that may enter a duct system due to improperly sealed duct joints or poorly installed and maintained duct systems.

CertainTeed Corp., Insulation Group, P.O. Box 860, Valley Forge, PA 19482; (800) 723-4866;