Key Features

• R4.2 Fiberglass Insulation – High-density fiberglass insulation core delivers an R-value of 4.2, effectively blocking heat loss in heating systems and preventing cold air penetration in cooling setups for year-round HVAC efficiency.
• 4-Inch Diameter, 25-Foot Length – Sized to fit standard 4-inch HVAC connections; the 25-foot run provides generous coverage for longer duct runs without splicing.
• Flexible Cylindrical Design – The flexible construction bends and routes around obstacles, joists, and tight spaces without requiring rigid fittings or specialized tools for installation.
• Silver Weather-Resistant Outer Jacket – The silver outer layer is designed to withstand temperature extremes and UV exposure, making it suitable for both indoor and outdoor installation environments including garages, rooftops, and basements.
• Compression and Tear Resistant – Thickened construction resists compression and tearing during installation and long-term use, helping maintain airflow performance over time.
• Lightweight and Easy to Cut – The flexible, lightweight form factor allows the duct to be cut to length and shaped on-site without heavy equipment, reducing installation time.
• Versatile Application Range – Suitable for HVAC air distribution, hot water pipe insulation, and cooling system ducting in residential and light commercial settings.
• Single Duct Included – Sold as one complete 25-foot insulated flexible duct section ready for installation.

Technical Specifications

Use Cases & Applications

The muctamo 4-inch R4.2 insulated flexible duct is well suited for a wide range of HVAC and insulation tasks:

• HVAC Air Distribution – Connect supply and return air runs in residential forced-air heating and cooling systems where a 4-inch duct connection is required.
• Attic & Crawl Space Runs – The flexible form routes easily through tight attic joists and crawl space framing without rigid elbow fittings.
• Basement & Garage Installations – The weather-resistant silver jacket handles temperature swings common in unconditioned spaces.
• Rooftop HVAC Connections – UV-resistant outer layer supports exposed rooftop duct runs where solar exposure is a factor.
• Pipe & Duct Insulation Wrap – R4.2 fiberglass insulation is also suitable for wrapping hot water pipes and cooling lines to reduce thermal transfer.

What Is Included

• 1 × muctamo Insulated Flexible Duct – 4 inch diameter, 25 feet long, R4.2 fiberglass insulation, silver outer jacket