Lambro Industries 516L Metalized Air Duct Connector 6 in X 25 Ft

Product Description

The LAMBRO INDUSTRIES 516L is a metalized flexible air duct connector designed for HVAC distribution systems where insulation is not required. Constructed from puncture-resistant laminated metalized polyester, this connector measures 6 inches in diameter and 25 feet in length. It carries the UL Label 181, Class 1 rating, confirming it meets recognized standards for air connector performance and fire safety. HVAC installers and sheet metal contractors use this connector where a lightweight, non-insulated flexible duct solution is needed to complete a distribution run or terminate at a terminal device.

The 516L is suited for residential and light commercial HVAC applications where the duct connector serves as part of an entire system or links supply boxes, diffusers, inlets, and other terminal devices. Because insulation is not incorporated into the product, it is best applied in conditioned spaces or in assemblies where a separate insulation wrap is specified by the design. It is sold as a single unit per package.

Key Features

• Puncture-resistant laminated metalized polyester construction for durability in tight routing conditions
• UL Label 181, Class 1 rated air connector — meets recognized fire and air-leakage performance standards
• 6-inch diameter x 25-foot length provides a full run in a single piece
• Non-insulated design for use where insulation is not required by the application or code
• Flexible construction permits connection to supply boxes, diffusers, inlets, and other terminal devices

Compatibility

Designed as an OEM-style flexible air duct connector for residential and light commercial HVAC distribution systems requiring a 6-inch, non-insulated Class 1 flexible connector compliant with UL 181.

Installation Notes

Installation should be performed by a licensed HVAC technician or qualified sheet metal contractor in accordance with applicable mechanical codes and UL 181 listing requirements. Shut down the air handling unit and verify the system is de-energized before making duct connections. Secure both ends of the connector with approved clamps or tape listed for use with UL 181 Class 1 air connectors. Do not exceed the connector's rated bend radius, as excessive kinking restricts airflow and may compromise the laminated jacket.

Technical Specifications

• Diameter: 6 inches
• Length: 25 feet
• Material: Laminated metalized polyester
• Weight: 2 pounds
• Certification: UL Label 181, Class 1
• Insulation: None
• Package Quantity: 1

Standard Information

• Brand: LAMBRO INDUSTRIES
• Manufacturer Part Number: 516L