Knauf Duct Wrap with KwikStretch Markings is a thermal and acoustical insulation made from highly resilient,
inorganic glass fibers bonded by a thermosetting resin. It is available unfaced, with a multi-purpose foil-scrim kraft (FSK) jacket,
a metalized polypropylene-scrim-kraft (PSK) jacket, or with white or grey vinyl vapor retarders. Vapor retarders have a 2" (51 mm) stapling flange on one edge,
and the factory-applied facing assures uniform quality. KwikStretch Markings on the staple flange (FSK and PSK only) allow for easy and accurated job site measurement.
