4' x 10' x 1-1/2" Air Duct Board with ECOSE Technology

Knauf Insulation EI-800-SL Eclipse Air Duct Board – Technical Product Information

Knauf Insulation EI-800-SL Eclipse Air Duct Board is a professional-grade rigid fiberglass ductboard engineered for the fabrication of rectangular and Max10 air duct systems. Designed for commercial and industrial HVAC applications, this board integrates advanced thermal and acoustic insulation performance with a durable, mold-resistant surface. Manufactured with ECOSE® Technology, a sustainable binder system free from formaldehyde, phenol, and acrylics, the EI-800-SL ensures reduced environmental impact while maintaining superior mechanical strength and ease of fabrication. The product provides excellent air stream performance, vapor barrier integrity, and long-term stability under demanding temperature and pressure conditions.

Technical Specifications

• Manufacturer: Knauf Insulation
• Model Number: 522134
• Product Series: Eclipse EI-800-SL
• Type: Single Sheet Fiberglass Duct Board
• Dimensions: 4 ft x 10 ft (48 in x 120 in)
• Thickness: 1-1/2 in (38 mm)
• Material: Inorganic Glass Fibers Bonded with ECOSE® Binder
• Surface Facing (Exterior): Foil-Scrim-Kraft (FSK) Vapor Retarder
• Airstream Surface: Black Fiberglass Mat Facing
• Thermal Conductivity (k-value): 0.23 BTU·in/hr·ft²·°F at 75°F (0.033 W/m·K)
• Temperature Range: -40°F to 250°F (-40°C to 121°C)
• Density: Approx. 3.0 lb/ft³ (48 kg/m³)
• Stiffness Rating: EI-800 (High Rigidity)
• Edge Options: Factory-molded shiplap or butt edge
• Vapor Barrier Permeance: ≤ 0.02 perms (UL 181-rated FSK facing)
• Fire Hazard Classification: Flame Spread ≤ 25, Smoke Developed ≤ 50 (ASTM E84)
• Microbial Resistance: EPA-registered antimicrobial surface; UL 181 compliant
• Sound Absorption: NRC 0.70–0.90 (depending on configuration)
• Service Application: Cooling, Heating, or Dual-Temperature Air Distribution Systems
• Environmental Certification: GREENGUARD Gold Certified for indoor air quality
• Compliance Standards: ASTM C518, ASTM C1071, ASTM E84, UL 181, NFPA 90A/B

Performance and Application Features

• Engineered for high-efficiency air distribution systems in commercial and institutional HVAC installations.
• FSK vapor retarder facing provides superior moisture control and prevents condensation.
• Black fiberglass airstream surface enhances air quality and provides a non-reflective finish inside duct systems.
• Meets UL 181 mold resistance requirements with antimicrobial-treated airstream surface.
• High structural rigidity supports easy fabrication of large duct sections with consistent dimensional stability.
• Lightweight composition simplifies handling, cutting, and assembly on-site.
• ECOSE® Technology binder improves environmental performance and reduces airborne chemical emissions.
• Available in both butt-edge and shiplap-edge configurations for system design flexibility.
• Compatible with standard mechanical fastening and sealing systems for duct fabrication.

Professional Summary

Knauf EI-800-SL Eclipse Air Duct Board is purpose-built for HVAC contractors requiring a high-performance fiberglass duct insulation solution that delivers superior mechanical strength, thermal control, and microbial protection. The EI-800 stiffness rating ensures dimensional stability in larger duct assemblies, while the FSK vapor retarder and black mat airstream surface deliver moisture and microbial resistance in compliance with UL and ASTM standards. With sustainable ECOSE® Technology and GREENGUARD certification, this ductboard supports modern construction standards for energy efficiency and indoor air quality, making it an optimal choice for commercial and institutional air distribution systems.