Mueller Streamline 180687 Commercial Flex Duct 14 in R-4.2

Product Description

The MUELLER STREAMLINE 180687 is a 14-inch commercial flexible HVAC duct designed for larger air distribution systems where routing flexibility and installation speed are priorities. Built with a metalized jacket and core, it provides moisture resistance and durability suited to demanding commercial environments. The R-4.2 insulation value supports energy efficiency in trunk extensions and branch runs. This duct is installed by licensed HVAC technicians and commercial sheet metal contractors working on air handling and distribution projects.

This flex duct is suited for commercial HVAC air distribution applications requiring 14-inch diameter duct runs. Typical installations include trunk extensions and branch runs in commercial buildings where the routing path requires flexibility that rigid duct cannot easily accommodate. The 25-foot length reduces the number of field connections needed per run, supporting faster installation. The metalized construction makes it appropriate for applications with moisture exposure concerns.

Key Features

• 14-inch diameter supports high-volume commercial airflow capacity
• R-4.2 insulation value reduces thermal loss along duct runs
• Metalized jacket and core construction for moisture resistance and durability
• 25-foot length minimizes field connections and speeds installation
• Flexible design allows routing around structural obstructions without rigid fittings

Compatibility

Designed as an OEM-style flexible duct replacement or new-installation component for commercial HVAC air distribution systems requiring 14-inch diameter flexible duct with R-4.2 insulation.

Installation Notes

Installation should be performed by a licensed HVAC technician or qualified sheet metal contractor in accordance with SMACNA guidelines and applicable local mechanical codes. Power down and lock out the air handling unit before connecting or repositioning duct sections. Support the duct at manufacturer-recommended intervals to prevent sagging, which reduces airflow and increases static pressure. Avoid compressing the insulation during installation, as this degrades the effective R-value.

Technical Specifications

• Diameter: 14 inches
• Insulation R-Value: R-4.2
• Jacket Type: Metalized
• Core Type: Metalized
• Length: 25 feet

Standard Information

• Brand: MUELLER STREAMLINE
• Manufacturer Part Number: 180687