Duct board is a rigid fiberglass insulation panel used to fabricate HVAC air ducts with built-in thermal and acoustic control.

Duct board is a pre-insulated HVAC material made from rigid fiberglass panels faced with a vapor-resistant foil or mat. It is designed to be cut, folded, and assembled into air ducts, combining the functions of ductwork and insulation into a single product.

In construction, duct board is commonly used in residential and light commercial HVAC systems, particularly for supply and return air ducts. Compared to traditional sheet metal ducts with external insulation, duct board offers quicker installation, reduced material handling, and improved sound absorption to help minimize airflow noise.

Proper fabrication and sealing are essential for duct board performance. Joints must be sealed with approved tapes and mastics to prevent air leakage and maintain efficiency. When installed according to manufacturer guidelines and mechanical codes, duct board provides effective thermal insulation, energy efficiency, and acoustic control within HVAC systems.

Duct board can significantly reduce HVAC system noise because the fiberglass core absorbs sound as air moves through the duct.

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