Patent ID: 8186387

Claim:
A flexible insulation material installed on an HVAC duct defining an airflow passage therein, the flexible insulation material comprising: a substrate containing nonwoven lofted fibers, the flexible insulation material being attached to the duct such that a first surface of the substrate faces a wall surface of the duct; and a first facer sheet laminated to a second surface of the substrate oppositely disposed from the first surface thereof, the facer sheet comprising a polymeric film bonded to the substrate, a metallization layer on the polymeric film and separated from the substrate by the polymeric film, and optionally a corrosion-resistant protective coating on the metallization layer; wherein the flexible insulation material is secured to the duct and provides thermal insulation and sound attenuation properties, and the nonwoven lofted fibers of the substrate are contained between the first facer sheet and the wall surface of the duct to prevent the nonwoven lofted fibers from being released from the flexible insulation material.