Quietflex 18MR6 Flexible Duct 18 in X 5 Ft R-6.0 10 Pack

Product Description

The QUIETFLEX 18MR6 is an R-6.0 insulated flexible duct section measuring 18 inches in diameter and 5 feet in length. Each box contains 10 pieces, providing 50 feet of flexible duct per order. This product is used in forced-air HVAC distribution systems to connect supply and return air plenums, trunk lines, and diffusers. The R-6.0 insulation rating helps limit heat gain and heat loss across unconditioned spaces such as attics and crawlspaces. Licensed HVAC technicians and sheet metal contractors are the primary installers of this product.

This flexible duct is suited for residential and light commercial forced-air systems. It is commonly routed through attic spaces, dropped ceilings, and mechanical rooms to deliver conditioned air from the air handler or furnace to individual supply registers. The 18-inch diameter accommodates larger trunk or main branch runs in systems with higher airflow requirements. Sold in boxes of 10 five-foot sections, making it practical for jobs requiring multiple shorter runs or precise fitment around obstructions.

Key Features

• R-6.0 insulation value limits thermal loss in unconditioned spaces
• 18-inch diameter fits larger supply and return branch or trunk runs
• 5-foot sections allow precise routing and fewer field cuts
• Box quantity of 10 pieces yields 50 feet of duct per order
• Flexible construction allows routing around structural and mechanical obstructions

Compatibility

Designed as an OEM-style replacement and new-installation flexible duct for residential and light commercial forced-air HVAC distribution systems requiring an 18-inch diameter flexible duct with R-6.0 insulation.

Installation Notes

Installation should be performed by a licensed HVAC technician in accordance with applicable mechanical codes, including SMACNA guidelines and local jurisdiction requirements. Power down and lock out the air handler or furnace before connecting or disconnecting duct sections. Secure connections at both ends with listed duct straps and approved mastic or metal-backed tape rated for duct applications. Avoid compressing or kinking the duct, as reduced cross-section significantly increases static pressure and reduces airflow.

Technical Specifications

• Diameter: 18 inches
• Length Per Piece: 5 feet
• Insulation R-Value: R-6.0
• Pieces Per Box: 10
• Total Length Per Box: 50 feet

Standard Information

• Brand: QUIETFLEX
• Manufacturer Part Number: 18MR6