Toughgard Rigid Liner Board is a stiff thermal and acoustical board that is designed to be a more damage resistant, smoother and tougher composite airstream surface, which helps guarantee a long-lasting, efficient duct system. The board is composed of rotary glass fibers bonded with a thermosetting resin. The black non-woven mat, when bonded to the airstream surface, adds strength without fiber erosion. The board is also EPA-registered as an anti-microbial agent.

CertainTeed, P.O. Box 860, Valley Forge, PA 19428-0101; 800/233-8990; www.certainteed.com.

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