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AFICO Duct Liner Rolls is intended for use in commercial, institutional, industrial and residential construction as thermal and acoustical insulation of heating air-conditioning and interior of dual temperature duct work, air handling equipment and plenums operating at air-velocities up to 20 m/s (4000 FPM) with actual test velocity at 10,000 FPM (2.5 times the rated capacity) and temperatures up to 232°C (450°F). Duct Liner Rolls used as an efficient sound absorption treatment of walls and ceilings, acoustic enclosures, generator rooms, studios, curtain walls, auditoriums, conference rooms, theaters and others.