Duct Board Products

Diffuser Board

Johns Manville diffuser board is designed for use in the fabrication of HVAC systems, air diffusers and register boxes. The airstream surface features a black glass mat, which provides a smooth interior surface that offers minimal resistance to air flow. JM diffuser board is available plain or with a tough fire-resistant FSK facing laminated to the exterior surface. JM diffuser board provides excellent thermal and acoustical performance.