Johns Manville DB-4X10X2-800 Duct Board 800 Mf Insulation

Product Description

The JOHNS MANVILLE DB-4X10X2-800 is a Micro-Aire duct board insulation sheet rated at 800 MF, designed for fabricating air distribution ducts in both residential and commercial HVAC systems. Measuring 2 inches thick by 48 inches wide by 120 inches long and weighing 22.52 pounds per sheet, it delivers thermal insulation and acoustical dampening in a single rigid panel. HVAC sheet metal workers and duct fabricators install this board as an alternative to conventional metal ductwork, cutting and assembling it into supply and return air distribution systems using standard duct board tooling.

Micro-Aire duct board is suited for new construction and retrofit duct fabrication in light commercial and residential applications. Its consistent density and composition support efficient shop or field fabrication. Installed duct board systems exhibit lower air leakage rates compared to unsealed metal ducts, which contributes to more stable supply temperatures and improved thermal efficiency throughout the conditioned space. The panel format reduces overall system weight relative to equivalent sheet metal assemblies, which can simplify support requirements in tight or overhead installations.

Key Features

• 2-inch thickness provides combined thermal insulation and acoustical performance in one panel
• 800 MF density rating supports structural rigidity for duct fabrication
• Full sheet dimensions of 48 inches x 120 inches reduce seam count in larger duct runs
• Lower installed air leakage compared to unlined metal ductwork
• Lightweight construction at 22.52 pounds per sheet eases handling and reduces support loading
• Consistent manufacturing process supports predictable cutting and assembly results

Compatibility

Designed for use in residential and commercial HVAC duct fabrication applications where rigid fiber glass duct board is specified.

Installation Notes

Installation should be performed by qualified HVAC technicians or duct fabricators familiar with fiber glass duct board systems. Power down the air handling unit and confirm the system is depressurized before connecting new duct sections. Follow SMACNA Fibrous Glass Duct Construction Standards and applicable local mechanical codes for joint closure, support spacing, and vapor retarder requirements. Avoid compressing or crushing the board face during handling, as surface damage can affect air-side performance.

Technical Specifications

• Density Rating: 800 MF
• Thickness: 2 inches
• Width: 48 inches
• Length: 120 inches
• Weight: 22.52 pounds

Standard Information

• Brand: JOHNS MANVILLE
• Manufacturer Part Number: DB-4X10X2-800