12" x 25' Silver Jacket Flex Duct, R6

Product Overview

The JP Lamborn MHP25R6B-12 Flexible Air Duct is an R-6 insulated air distribution component engineered for use in residential and light commercial HVAC systems. Constructed with a wire-reinforced inner core, fiberglass insulation, and a silver vapor-barrier jacket, this duct provides efficient airflow, mechanical flexibility, and dependable thermal performance. Suitable for both supply and return air applications, the MHP25R6B-12 meets UL, NFPA, and SMACNA standards for flexible duct construction and installation.

Technical Specifications

• Model: MHP25R6B-12
• Manufacturer: JP Lamborn (Hart & Cooley)
• Series: Residential
• Product Type: Insulated Flexible Air Duct
• Inside Diameter: 12 inches
• Length: 25 feet
• Insulation Value: R-6
• Outer Jacket: Silver vapor-barrier jacket providing moisture resistance and mechanical protection
• 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 insulation with polyethylene vapor barrier
• Application: Supply and return air distribution for 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 mechanical code requirements

Professional Notes

Install per JP Lamborn and SMACNA flexible duct standards. Fully extend all duct sections during installation to maintain airflow performance and minimize static pressure losses. Support ducts at regular intervals to prevent sagging and preserve insulation thickness. All joints and fittings must be sealed with UL 181-approved mastic or tape to ensure airtight integrity. Avoid sharp bends, compression, and mechanical stress to protect core and insulation performance.

Summary

The JP Lamborn MHP25R6B-12 Flexible Air Duct is a 12-inch diameter, 25-foot R-6 insulated duct with 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 performance for professional residential and light commercial HVAC installations.