Sonopan soundproof wood fibre panel, 3/4 in. x 4 ft. x 8 ft. Used for sound insulation of residential, institutional, industrial or commercial buildings under construction or renovation. Multiple applications: walls and ceilings, music studios, walls partitions, multi-housing units, home theatres, etc. Reduces noise transmission between the wall partitions and ceilings. Its density, its increased thickness, its perforations on the surface and its unique method of inflating the fibres allow the panels to maximize the sound absorption coefficient. No fire retardant treatment. Easy to cut and to install.