5" x 25' Silver Jacket Flex Duct, R6

Product Overview

The JP Lamborn MHP25R6B-05 Flexible Air Duct is an R-6 insulated duct assembly designed for residential and light commercial HVAC systems. This duct provides efficient air distribution for both supply and return applications. Constructed with a durable silver vapor-barrier jacket, fiberglass insulation, and a wire-reinforced inner core, it delivers consistent airflow and thermal performance while meeting UL and NFPA standards for flexible air ducts.

Technical Specifications

• Model: MHP25R6B-05
• Manufacturer: JP Lamborn (Hart & Cooley)
• Series: Residential
• Product Type: Insulated Flexible Air Duct
• Inside Diameter: 5 inches
• Length: 25 feet
• Insulation Value: R-6
• Outer Jacket: Silver vapor-barrier jacket for 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: Supply and return air distribution in residential and light commercial HVAC systems
• Compliance: UL 181 Class 1 Air Duct; conforms to NFPA 90A and NFPA 90B standards
• Installation: Approved for use in conditioned and unconditioned spaces in accordance with local mechanical codes

Professional Notes

Install in compliance with JP Lamborn and SMACNA flexible duct installation standards. Fully extend the duct to minimize static pressure losses and maintain rated airflow performance. Provide adequate support at recommended intervals to prevent sagging and insulation compression. All joints and fittings must be sealed using UL 181-approved tape or mastic to ensure air-tight performance. Avoid sharp bends, excessive compression, or mechanical damage to preserve the duct’s structural and thermal integrity.

Summary

The JP Lamborn MHP25R6B-05 Flexible Air Duct is a 5-inch diameter, 25-foot R-6 insulated duct featuring a silver vapor-barrier jacket. Rated for 5000 fpm airflow and -20°F to 140°F operation, it provides durable, thermally efficient, and code-compliant air distribution performance for professional HVAC installations.