Description Flexible air duct glass wool blanket is manufactured from rotary-process fiber glass provides excellent acoustical and thermal performance. It is lightweight,Website:://.unitedglasswool.com, highly resilient, blanket-type thermal material.AVAILABLE FORMS Plain BlanketAdvantage Reduces HVAC equipment and air-movement noise  Easy to handle Outstanding thermal and acoustical performance THERMAL PERFORMANCETest according to ASTM C518 at 23°176°. Thermal conductivity as low as 0.032 W/mKSound Absorption PERFORMANCE Tested in accordance and comply with ASTM C 423fire-resistant property B.S. 476: Part 4 Non-combustibility test for materials B.S. 476: Part 6 Fire propagation B.S. 476: Part 7 Surface spread of flame ASTM E84 ApplicationFlexible air duct glass wool blanket is used for air conditioning are meant for residential and industrial air movement applications.