Imperial MEA-0425-6 Flexible Air Duct 4in X 25ft R-6.0

Product Description

The IMPERIAL MFG GROUP USA INC MEA-0425-6 is a 4-inch diameter, 25-foot flexible air duct rated at R-6.0 insulation value, designed for use in heating, ventilation, and air conditioning systems. It features a 2-ply polyester laminated inner core that resists tearing and unraveling under normal duct pressure and movement. The fiberglass-reinforced metalized outer jacket adds structural integrity and reflects radiant heat loss. This duct meets UL 181 and ULC S-110M Class 1 Air Duct standards, making it appropriate for residential and light commercial HVAC installations where code-compliant flexible duct is required. Licensed HVAC technicians and sheet metal contractors are the primary installers.

The MEA-0425-6 is suited for branch runs in forced-air residential HVAC systems, connecting supply plenums or trunk lines to diffusers and registers. Its 25-foot length accommodates longer branch runs without splicing, and the 4-inch diameter fits standard residential supply outlets. The R-6.0 insulation rating meets or exceeds energy code minimums in many jurisdictions for duct installed in unconditioned spaces such as attics and crawlspaces. This duct is appropriate for both new construction and retrofit applications where flexible duct is specified.

Key Features

• R-6.0 insulation rating suitable for unconditioned space installation
• UL 181 and ULC S-110M Class 1 Air Duct certified
• 2-ply polyester laminated inner core for tear and unravel resistance
• Fiberglass-reinforced metalized outer jacket for durability and radiant heat control
• 4-inch diameter x 25-foot length for standard residential branch runs
• Compatible with heating, ventilation, and air conditioning systems

Compatibility

Designed as an OEM-style flexible duct replacement or new-installation component for residential and light commercial heating, ventilation, and air conditioning systems requiring 4-inch Class 1 flexible air duct.

Installation Notes

Installation should be performed by a licensed HVAC technician or sheet metal contractor in accordance with local mechanical codes and ACCA Manual D duct design guidelines. Power down the air handler and close the fuel shutoff or disconnect before opening the duct system. Secure both ends with approved duct clamps or straps and mastic or UL 181-listed tape — never use standard cloth-backed tape. Support the duct at intervals per local code to prevent sagging, which increases static pressure and reduces airflow efficiency.