Lambro Industries 622 Flexible Duct Connector 4in X 20ft

Product Description

The LAMBRO INDUSTRIES 622 is a flexible duct connector designed for use in residential and light commercial HVAC and ventilation systems. Constructed from a 5-layer foil laminate, it provides a durable, low-resistance airflow path between ducted components. The connector measures 4 inches in diameter and ships in a 20-foot length, giving installers enough material to complete a full run or multiple shorter connections in a single piece. HVAC technicians and sheet metal contractors rely on this type of flexible connector to bridge rigid ductwork sections, accommodate minor misalignments, and reduce vibration transfer in forced-air systems.

This connector is suited for dryer venting, bath exhaust, kitchen ventilation, and general forced-air HVAC applications where a 4-inch round flexible duct is required. The 20-foot length accommodates longer runs common in residential construction and light commercial retrofits. It is appropriate for installations requiring a compact, lightweight connector that can be routed through tight spaces or around obstructions. The foil laminate construction makes it compatible with applications that require a more rigid, tear-resistant flexible duct over standard vinyl or mylar alternatives.

Key Features

• 5-layer foil laminate construction for improved durability and tear resistance
• 4-inch diameter fits standard round duct fittings and collars
• 20-foot length allows full runs or multiple connections from a single piece
• Flexible design accommodates misalignment and reduces vibration transmission
• Lightweight at 10.75 pounds per unit, reducing handling effort during installation

Compatibility

Designed as an OEM-style replacement and general-use flexible duct connector for residential and light commercial 4-inch round duct systems.

Installation Notes

Installation is typically performed by licensed HVAC technicians or sheet metal contractors. Power down or de-energize the air handling unit before connecting or disconnecting ductwork. Secure both ends of the flexible connector to rigid duct collars using approved metal clamps or UL-listed foil tape in accordance with local mechanical codes. Avoid sharp bends or compression of the flex duct, as these conditions restrict airflow and reduce system efficiency.

Technical Specifications

• Diameter: 4 inches
• Length: 20 feet
• Construction: 5-layer foil laminate
• Weight: 10.75 pounds
• Unit of Measure: Each
• Package Quantity: 12

Standard Information

• Brand: LAMBRO INDUSTRIES
• Manufacturer Part Number: 622