... FSK facing for duct wrap for HVAC systems and metal building insulation. Building Material: to be sealed on ... glass wool or other duct wraps of HVAC system, or to be used as sound/ ... , or works as vapor barrier and thermal insulation facing of metal building. Material: Characteristic: fire retardant, anticorrosive, easy to ... , 300, 500, 1800, 3000m Foil Scrim Kraft Of Metal Building Material