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

Product Overview

The JP Lamborn MHP25B-07 Flexible Air Duct is an R-4.2 insulated air distribution component designed for residential and light commercial HVAC systems. This flexible duct provides efficient airflow, thermal insulation, and ease of installation in supply and return air applications. Constructed with a wire-reinforced inner core, fiberglass insulation, and a durable silver vapor-barrier jacket, the MHP25B-07 ensures consistent air delivery and compliance with UL and NFPA standards for flexible duct systems.

Technical Specifications

• Model: MHP25B-07
• Manufacturer: JP Lamborn (Hart & Cooley)
• Series: Residential
• Product Type: Insulated Flexible Air Duct
• Inside Diameter: 7 inches
• Length: 25 feet
• Insulation Value: R-4.2
• Outer Jacket: Silver vapor-barrier jacket for moisture protection and mechanical durability
• 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 per local and national mechanical codes

Professional Notes

Install in accordance with JP Lamborn and SMACNA flexible duct installation standards. Fully extend duct lengths to minimize static pressure loss and ensure rated airflow performance. Provide adequate support at regular intervals to prevent sagging or insulation compression. All connections must be sealed with UL 181-approved mastic or tape for airtight performance. Avoid excessive bending, compression, or kinking to maintain airflow capacity and insulation integrity.

Summary

The JP Lamborn MHP25B-07 Flexible Air Duct is a 7-inch diameter, 25-foot R-4.2 insulated duct featuring a silver vapor-barrier jacket. Rated for 5000 fpm and -20°F to 140°F operation, it delivers code-compliant, thermally efficient, and durable performance for professional residential and light commercial HVAC air distribution systems.