Lambro Industries 413 Flexible Duct 3in X 25ft Aluminum

Product Description

The LAMBRO INDUSTRIES 413 is a 3-inch diameter, 25-foot aluminum film laminated flexible duct designed for low-pressure exhaust and ventilation transitions in residential and light commercial applications. Constructed with an aluminum film laminate, it provides a lightweight, semi-rigid pathway for conditioned or exhaust airflow where rigid metal duct is not practical for short transition runs. This duct is sold individually and is installed by HVAC technicians and sheet metal workers as part of a complete duct system. It is important to note that this product is not a substitute for rigid metal duct and should be used only in approved transition applications per applicable codes.

The 413 is commonly used in residential HVAC systems as a flexible transition connector between rigid ductwork and equipment such as dryers, exhaust fans, or air handlers where a short flexible section is needed to accommodate equipment alignment or vibration isolation. Its 25-foot length provides sufficient material for most standard transition and short-run applications. It ships in an individual carton, making it straightforward to handle and store on a service vehicle or at a job site.

Key Features

• 3-inch diameter x 25-foot length suitable for short transition and connector runs
• Aluminum film laminate construction provides a lightweight, flexible form factor
• Not a substitute for rigid metal duct — intended for approved flexible transition applications only
• Sold individually in a single carton for easy jobsite handling
• Lightweight at 2 pounds, reducing handling effort during installation

Compatibility

Designed as a flexible transition duct for residential and light commercial low-pressure exhaust and ventilation applications requiring a 3-inch diameter flexible connector.

Installation Notes

Installation should be performed by a licensed HVAC technician or sheet metal worker in accordance with local mechanical codes and ASHRAE or IMC guidelines for flexible duct use. Power down and lock out all connected equipment before beginning any duct connection work. This duct must not replace rigid metal duct in primary duct runs — use only in approved short transition applications. Secure all connections with approved clamps or foil tape rated for the application.

Technical Specifications

• Diameter: 3 inches
• Length: 25 feet
• Material: Aluminum Film Laminate
• Weight: 2 pounds
• Package Quantity: 1

Standard Information

• Brand: LAMBRO INDUSTRIES
• Manufacturer Part Number: 413