Check out this video of a customer's state of the art facility under construction. They required an R-8 insulation for the duct work that ran throughout the
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rFOIL Reflective Insulation and Radiant Barriers - Safe, Clean, Effective
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Reflectix R-21 Attic Wall Unfaced Reflective Roll Insulation 400-sq ft (48-in W x 100-ft L) Individual Pack in the Roll Insulation department at