Pre-kerfed, fiberglass spiral duct liner, with a glass mat airstream surface, coated with an antimicrobial coating (Service temp: 250°F)

Johns Manville Spiracoustic Plus® is a spiral duct liner system engineered to provide superior acoustical and thermal performance for spiral air duct interiors with an airstream diameter of 6 inches and larger. Spiracoustic Plus delivers significantly improved acoustical and thermal performance compared to double-wall construction, all at a competitive cost for the system. It is manufactured with evenly-spaced kerfs to allow the material to conform to the inside diameter of spiral ducts, producing a finished airstream surface. This surface is coated with our proprietary Permacote® coating, which provides a durable surface and added product protection against microbial growth. As an added benefit, the exterior surface is laminated with a tough fire-resistant FSK facing. 

NRC: 0.85 (R6)
R Value: 6.4 ( 1.5")
ASTM C1071 Type III: Complies
Greenguard: Certified

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