Mueller Streamline 13102514h Flex Duct 14in X 25ft R-8.0

Product Description

The MUELLER STREAMLINE 13102514h is a 14-inch diameter, 25-foot insulated flexible duct designed for HVAC air distribution applications. It features a metalized polyester outer jacket reinforced with fiberglass scrim, providing durable protection against moisture and physical damage. The core is a double-ply black polyester construction wrapped in R-8.0 formaldehyde-free insulation, helping minimize heat gain or loss across supply runs. UL listed for safety compliance, this flex duct is packaged in a box for clean jobsite handling. HVAC technicians and sheet metal installers use this product for branch runs, transitions, and connections between air handlers or plenums and diffusers.

This flex duct is suited for residential and light commercial HVAC systems where insulated flexible branch duct is required. The 14-inch diameter targets higher-flow trunk-to-register transitions, main branch runs, or connections to large diffusers and grilles in commercial-style installations. Its R-8.0 insulation value meets energy code requirements in most jurisdictions, making it appropriate for unconditioned spaces such as attics, crawlspaces, and mechanical rooms. The 25-foot length provides a full single-carton run for most branch applications without mid-run splicing.

Key Features

• R-8.0 formaldehyde-free insulation meets current energy code minimums for duct insulation in unconditioned spaces
• Metalized polyester outer jacket reinforced with fiberglass scrim for durability and vapor resistance
• Double-ply black polyester inner core provides a smooth, flexible air passage
• UL listed construction for code-compliance confidence on commercial and residential installs
• 25-foot boxed length reduces jobsite waste and simplifies material handling
• 14-inch diameter suits high-volume branch runs and large diffuser connections

Compatibility

Designed as an OEM-style flexible duct for residential and light commercial HVAC air distribution systems requiring a 14-inch insulated flex duct with R-8.0 insulation.

Installation Notes

Flex duct of this diameter should be installed by a licensed HVAC technician in accordance with SMACNA guidelines and local mechanical codes. Power down and lock out the air handling unit before making duct connections. Avoid sharp bends, compression, or excessive sag, as these conditions reduce airflow and system efficiency. Secure both ends with approved clamps or draw bands and seal with mastic or UL 181B-listed tape before insulating any exposed fittings.

Technical Specifications

• Diameter: 14 inches
• Length: 25 feet
• Insulation R-Value: R-8.0
• Core Type: Double-Ply Black Polyester
• Jacket Material: Metalized Polyester with Fiberglass Scrim Reinforcement
• Insulation Type: Formaldehyde-Free
• Application: HVAC Venting
• Listing: UL Listed
• Packaging: Boxed

Standard Information

• Brand: MUELLER STREAMLINE
• Manufacturer Part Number: 13102514h