5" x 25' Silver Jacket Flex Duct, R8

Product Overview

The JP Lamborn MHP25R8B-05 Flexible Air Duct is an R-8 insulated duct assembly designed for use in residential and light commercial HVAC systems. Built with a durable silver vapor-barrier jacket and a fiberglass-insulated, wire-reinforced inner core, this duct provides efficient thermal performance and consistent airflow delivery. Engineered for both supply and return air applications, the MHP25R8B-05 meets performance standards for energy efficiency, air velocity, and temperature range in modern HVAC installations.

Technical Specifications

• Model: MHP25R8B-05
• Manufacturer: JP Lamborn (Hart & Cooley)
• Series: Residential
• Product Type: Insulated Flexible Air Duct
• Inside Diameter: 5 inches
• Length: 25 feet
• Insulation Value: R-8
• Outer Jacket: Silver vapor-barrier jacket providing moisture and abrasion 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: Fiberglass blanket with polyethylene vapor barrier
• Application: Air distribution for supply and return lines in HVAC systems
• Mounting: Approved for use in conditioned and unconditioned spaces
• Compliance: UL 181 Class 1 Air Duct; conforms to NFPA 90A and 90B standards

Professional Notes

Install in accordance with JP Lamborn and SMACNA flexible duct installation standards. Fully extend duct lengths to maintain system airflow and minimize pressure loss. Provide adequate support spacing to prevent sagging and maintain proper insulation thickness. Seal all joints using UL 181-approved tapes or mastics to ensure air-tight connections. Avoid compression, sharp bends, or mechanical damage that may compromise duct performance or insulation integrity.

Summary

The JP Lamborn MHP25R8B-05 Flexible Air Duct is a 5-inch diameter, 25-foot R-8 insulated duct with a silver vapor-barrier jacket. Rated for 5000 fpm and -20°F to 140°F operation, it provides a durable, thermally efficient, and code-compliant solution for professional air distribution in residential and light commercial HVAC systems.