6" x 25' Silver Jacket Flex Duct, R4.2

Product Overview

The JP Lamborn MHP25B-06 Flexible Air Duct is an insulated, R4.2-rated air distribution component designed for residential and light commercial HVAC systems. Manufactured with a durable silver jacket and a flexible core, this duct provides efficient airflow delivery and thermal performance within standard forced-air heating and cooling systems. Engineered for straightforward installation, it meets performance and code requirements for indoor air distribution and mechanical system applications.

Technical Specifications

• Model: MHP25B-06
• Manufacturer: JP Lamborn (Hart & Cooley)
• Series: Residential
• Product Type: Insulated Flexible Air Duct
• Inside Diameter: 6 inches
• Length: 25 feet
• Insulation Value: R-4.2
• Outer Jacket: Silver vapor-barrier jacket for moisture resistance
• Air Velocity Rating: 5000 fpm (maximum)
• Temperature Range: -20°F to 140°F (-29°C to 60°C)
• Core Construction: Helically wound wire-reinforced inner core
• Insulation Type: Thermal fiberglass blanket
• Application: Supply and return air ducts in HVAC systems
• Compliance: UL 181 Class 1 Air Duct; meets NFPA 90A and 90B standards
• Installation: Approved for use in residential and light commercial duct systems

Professional Notes

Install in accordance with local mechanical code and manufacturer’s guidelines. Ensure duct runs are fully extended to minimize static pressure loss and maintain system efficiency. Support at regular intervals per SMACNA standards to prevent sagging. Avoid exposure to sharp edges or excessive bending to protect the inner core and insulation integrity. Properly seal all connections using UL 181-approved mastic or tape.

Summary

The JP Lamborn MHP25B-06 Flexible Air Duct is a 6-inch diameter, 25-foot insulated duct with an R4.2 thermal rating and a silver vapor-barrier jacket. Rated for 5000 fpm and -20°F to 140°F operation, it provides code-compliant, durable air distribution performance for professional HVAC installations.