Johns Manville
New duct liner with very small diameter

This product is the first of its kind, engineered specifically for smaller diameter spiral duct applications, with outer diameters ranging from 6 to 8 inches. The insulation is offered in 1-inch thickness only and is the newest addition to the Spiracoustic Plus portfolio.
Based on JM’s proprietary fiberglass board technology, Spiracoustic Plus duct liner has factory-made, evenly spaced kerfs to allow the material to conform to the inside diameter of spiral ducts. This creates a single-wall insulation solution for spiral duct applications of all sizes.
Like the other sizes in the Spiracoustic Plus duct liner portfolio, VVSD is bonded with a thermosetting resin and is specifically engineered to provide very good acoustic and thermal performance in spiral ducts. The airstream surface and transverse edges are protected with JM’s factory-applied, black Permacote acrylic coating for added protection for the airstream surface.