Manson Alley Wrap B Fiberglass Duct Wrap

ALLEY WRAP B fiberglass blanket insulation is a thermal and acoustical insulation product made from highly resilient, inorganic glass fibers bonded by a bio-based technology. It is available unfaced or with a multi-purpose foil-scrim kraft (FSK) jacket. Vapor retarders have a 2″ (51 mm) stapling flange on one edge, and the factory-applied facing assures uniform quality.

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Product Description

Manson ALLEY WRAP B is used as an external insulation on commercial or residential heating or air conditioning ducts. It is suitable for the exterior of rectangular or round sheet metal ducts and spaces, or surfaces where temperature and condensation must be controlled.


  • Greenguard Certification
    – Greenguard GOLD certified for superior indoor air quality performance
    – Over 50% post-consumer recycled glass
    This product is tested and certified to meet EUCEB requirements
  • Surface Burning Characteristics
    – UL/ULC Classified FCH 25/50 (FSK, unfaced)
    – Unfaced and FSK wrap have a Flame Spread 25 and Smoke Delvelopped 50 when tested in accordance with ASTM E 84, CAN/ULC S102-M88, NFPA 55 and UL 723 PSK wrap has a Flame Spread 25 and Smoke Developed 50 when tested in accordance with ASTM E 84
  • Temperature Limitation (ASTM C 411)
    – Faced, can be used on ducts operating up to 250°F (121°C)
    – Unfaced, up to 350°F (177°C)
  • Water Vapor Transmission (ASTM E 96, Procedure A)
    FSK and white PSK facings have maximum water vapor permeance of .02 perms
  • Water Vapor Sorption (ASTM C 1104)
    Less than 5% by weight when tested for 96 hours at 120°F (49°C) and 95% relative humidity
  • Corrosiveness (ASTM C 665)
    Will not accelerate corrosion of a steel panel compared to sterile cotton
  • Corrosion (ASTM C 1617)
    The corrosion rate in mils/yr will not exceed that of the 1ppm chloride solution
  • Mold Growth (ASTM C 1338)
    No growth
  • Puncture Resistance (TAPPI Test T803) (Beach Units)
    FSK and PSK: 25

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General Insulation Company Inc. is an insulation supplier / insulation distributor that stocks and fabricates a wide variety of industrial and commercial air barrier, vapor barrier, moisture and water barrier products for the construction market.

Manson Alley Wrap B Technical Data Sheet

Manson Alley Wrap B Safety Data Sheet

Alley Wrap B Environmental Transparency Report

Alley Wrap B Recycled Content Validation Summary