ToughGard® Ultra*Round™ Spiral Duct Liner

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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.

CertainTeed cares about the environment and Building Responsibly™, and for more than 100 years has maintained a commitment to provide sustainable, innovative solutions that improve energy efficiency and comfort. From production to product, CertainTeed's focus has been on minimizing its impact on the environment by reducing energy consumption, conserving renewable resources and lowering greenhouse gas emissions. And with our Sustainable Insulation® fiber glass products, the mission continues. Visit for more information or watch our YouTube video.

ToughGard® Ultra*Round products perform in HVAC systems operating at positive static air pressures, air velocities up to 6,000fpm (30.5 m/s) and temperatures up to 250ºF (121ºC).

ToughGard® Ultra*Round spiral duct liner products meet the requirements of the following current specifications, standards and codes:
  • Material Specifications ASTM C1071Type II insulation
  • Fire Safety Standards NFPA 90A, NFPA 90B
  • Model Building Code ICC
  • Fire Hazard Classification UL723, ASTME84

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.

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.

Please refer to the CertainTeed ToughGard® Lifetime Warranty.