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The Quietflex 770C Rip-Stop Silver Jacket Flex Duct features a metallic polyester-vapor barrier with a special ". Johns Manville Formaldehyde-Free Insulation. Oversized Core. R6.0 - Boxed. C. tp + 10" Static Pressure.
The Quietflex 770C is a flexible air duct with a metallic polyester-vapor barrier and Johns Manville Formaldehyde-Free Insulation.
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