The Sonex® Rondo Sound Baffle offers design versatility and excellent sound absorption across all frequencies preventing noise build-up that interferes with speech intelligibility. Sonex Rondo® Baffles are made from a foam core, which is Class 1 fire-rated according to ASTM E84 for flame spread and smoke density. The acoustical foam core also meets the corner burn test UL 1715.These Sonex® Rondo Baffles are available in lengths up to 24? with 6? or custom diameters.