Cost-Effective Alternative to Double Wall Systems


ToughGard® Ultra*Round is acoustical and thermal insulation for lining the interior of spiral and round sheet metal ducts and plenums in HVAC systems. It is used to reduce heat gain or loss while also absorbing unwanted crosstalk, equipment and air rush noise.


CertainTeed ToughGard® Ultra*Round spiral duct liner provides many benefits to both the contractor and building owner: Eliminates the cost of perforated metal lining required for double wall construction. Simplifies fabrication and installation in the shop and on the job. Reduced weight compared to double wall construction. May eliminate the need for pins and adhesives in most straight duct sections. Improves acoustical performance over double wall systems. Lower installed cost than double wall systems. Tough, durable and cleanable air stream surface that contains an EPA registered antimicrobial agent. These insulation products may qualify for rebates and other incentives. For more information, visit for your area’s specific offers.

Technical Information

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All fabrication, application and installation steps shall be in accordance with the requirements of the NAIMA Fibrous Glass Duct Liner standard, or the SMACNA HVAC Duct Construction standard and the project specification.Refer to the CertainTeed installation manuals or CertainTeed specification sheets for installation guidelines. MAINTENANCE An inspection and preventative maintenance program for the HVAC system is recommended to ensure optimum performance.Insulation should be kept clean and dry during shipping, storage, installation, and system operation.

Warranty Details

Please refer to the CertainTeed ToughGard® Lifetime Warranty.