Lambro Industries 320L 4 Inch Aluminum Duct Extension Kit

Product Description

The LAMBRO INDUSTRIES 320L is a universal flexible aluminum duct extension kit designed to extend or repair 4-inch flexible aluminum duct runs in residential and light commercial ventilation systems. The kit includes one 4-inch duct connector and two worm gear clamps, giving installers everything needed to make a secure, airtight connection between duct sections. At 3.6 pounds, the kit ships as a single unit and is packaged in a poly bag. HVAC technicians and installers rely on this type of kit for dryer exhaust, bathroom exhaust fan, and range hood duct extensions where a clean, low-profile connection is required.

The 320L is suited for use with 4-inch flexible aluminum duct and Lama-Flex vinyl duct. It is a practical solution when an existing duct run falls short of the termination point or when a damaged section needs to be bridged without replacing the full duct run. The universal design accommodates standard 4-inch duct in typical residential ventilation installations.

Key Features

• Universal fit for 4-inch flexible aluminum duct and Lama-Flex vinyl duct
• Includes one 4-inch duct connector for a direct, secure join
• Two worm gear clamps included for positive clamping on both sides of the connection
• Flexible aluminum construction allows routing around obstacles
• Poly bagged packaging keeps components together for jobsite use

Compatibility

Designed for use with 4-inch flexible aluminum duct and Lama-Flex vinyl duct in standard residential ventilation applications.

Installation Notes

Installation is performed by HVAC technicians or qualified installers. Before beginning work, disconnect power to any equipment connected to the duct run, including exhaust fans or dryer units. Slide the worm gear clamps onto each duct section before inserting the connector, then tighten the clamps firmly over the connector bead to ensure an airtight seal. Follow applicable local mechanical codes for duct extension length limits and termination requirements.

Technical Specifications

• Duct Diameter: 4 inches
• Kit Contents: One 4-inch duct connector, two worm gear clamps
• Weight: 3.6 pounds
• Unit of Measure: EA
• Package Quantity: 12

Standard Information

• Brand: LAMBRO INDUSTRIES
• Manufacturer Part Number: 320L