Quietflex 16KM Flexible Duct 16 Inches R-4.2 25 Feet

Product Description

The QUIETFLEX 16KM is a 16-inch diameter flexible duct designed for high-capacity airflow in residential and light commercial HVAC systems. The duct ships in a 25-foot length and carries an R-4.2 insulation value, providing reliable thermal protection that helps maintain consistent supply and return air temperatures. A foil outer jacket resists tearing and moisture intrusion, while the flexible inner core supports smooth, low-noise airflow. Licensed HVAC technicians and sheet metal installers work with this product during new construction and system retrofit projects.

The 16KM is suited for both supply and return air trunk and branch runs in forced-air systems. Its 16-inch diameter makes it appropriate for high-volume main-trunk applications in residential systems and smaller commercial air-handling setups. The 25-foot continuous length reduces the number of joints required, which limits potential air leakage points in the duct run.

Key Features

• 16-inch inside diameter supports high-volume airflow in large trunk runs
• R-4.2 insulation value limits conductive heat gain and loss
• Foil outer jacket resists tearing, puncture, and moisture
• 25-foot length reduces connection points and potential leakage
• Flexible inner core allows bending around framing and obstructions
• Suitable for both supply and return air applications

Compatibility

Designed as an OEM-style flexible duct section for use in residential and light commercial forced-air HVAC systems requiring a 16-inch round duct connection.

Installation Notes

Installation should be performed by a licensed HVAC technician in accordance with applicable mechanical codes and SMACNA flexible duct installation standards. Power down and lock out the air-handling unit before connecting or modifying any duct sections. Secure each end with an approved clamp and mastic or UL-listed foil tape — do not use standard cloth duct tape. Keep bends as gradual as possible and avoid sharp kinks that restrict airflow and reduce system efficiency.

Technical Specifications

• Diameter: 16 inches
• Length: 25 feet
• Insulation R-Value: R-4.2
• Jacket Material: Foil
• Application: Supply and return air

Standard Information

• Brand: QUIETFLEX
• Manufacturer Part Number: 16KM