Knauf Insulation 503924 Fiberglass Duct Board 8-pack

Product Description

The KNAUF INSULATION 503924 is a rigid fiberglass duct board used to fabricate and insulate air distribution systems in residential and light commercial HVAC installations. Each board measures 48 inches by 96 inches by 1 inch and is sold in a package of 8 boards. This duct board is designed to function as both the structural duct wall and the thermal and acoustic insulation layer, eliminating the need for separate sheet metal duct and wrap insulation. HVAC technicians and sheet metal fabricators use this product to build supply and return air plenums, rectangular ducts, and transition sections directly from the board stock.

This duct board is suited for low-velocity forced-air systems in residential new construction and retrofit applications, as well as light commercial projects. It is fabricated on-site using standard duct board knives, T-squares, and V-groove tools to cut and score the board before forming and taping into finished duct sections. The Atmosphere product line is engineered for interior air duct applications where thermal performance and air-side surface integrity are required.

Key Features

• Rigid fiberglass construction serves as both duct wall and insulation in a single board
• 48 x 96 x 1 inch panel size provides full-sheet coverage for efficient duct fabrication
• 8-board bundle reduces handling and restocking frequency on active job sites
• Designed for on-site fabrication of rectangular supply and return air ducts
• Interior air-side surface resists erosion under normal system operating velocities

Compatibility

Designed as an OEM-style replacement and standard fabrication material for rigid fiberglass duct board systems in residential and light commercial forced-air HVAC applications.

Installation Notes

Installation should be performed by a licensed HVAC technician or qualified sheet metal fabricator following SMACNA Fibrous Glass Duct Construction Standards and local mechanical codes. Power down the air handling system completely before connecting or modifying any duct section. Use manufacturer-approved foil-faced tape or pressure-sensitive tape rated for duct board applications to seal all joints and seams. Do not compress the board during handling, as deformation reduces the insulating value of the finished duct.

Technical Specifications

• Panel Width: 48 inches
• Panel Length: 96 inches
• Panel Thickness: 1 inch
• Quantity per Package: 8 boards

Standard Information

• Brand: KNAUF INSULATION
• Manufacturer Part Number: 503924