Dryer Duct

The Lambro semi-rigid 4-inch x 8-foot UL 2158A transition duct is ideal for venting an electric or gas clothes dryer to the wall pipe. Most clothes dryer manufacturers recommend UL 2158A-certified semi-rigid ducts.

The transition duct is for new and replacement clothes dryer installations. The semi-rigid duct is flexible; the corrugations throughout prevent collapsing and allow for easy duct bending when needed. Class 0 aluminum is corrosion-resistant, non-combustible, and flame-resistant, with a maximum operating temperature of 600°F. When installing the duct, you can cut it to length to allow for stretching for maximum airflow.

A semi-rigid and lightweight non-insulated flexible duct, triple lock is manufactured using a dead soft aluminum strip, spirally wound and mechanically joined together, forming an air-tight and leakproof triple lock seam. The duct manufacturing material is 100% aluminum. The certified UL 2158A duct contains a UL marking on each length.

Please be sure to check local building codes before installation. Please check your clothes dryer manufacturer’s manual for proper installation and exhausting of the clothes dryer.

Product features and benefits:

Bulk pack
Most clothes dryer manufacturers recommend UL 2158A-certified semi-rigid ducts
Do not exhaust the clothes dryer into the chimney, a wall, a ceiling, or a concealed space of a building
Installation from clothes dryer exhaust outlet to the wall pipe to the outside
Installations lengths of 8′ or less
UL 2158A certified marked and listed duct
For use with electric or gas clothes dryers
Maximum operating temperature of 600°F
Flame-resistant
Non-combustible
Maximum operating temperature of 600°F
Installation clamps (not included)

Product Contains:
(1) 4-inch x 8-foot UL 2158A clothes dryer transition duct (semi-rigid)

Do you need clamps to install the duct?
Recommended Clamps

Guideline for Transition Ducts
In December 2006, Underwriters Laboratories introduced UL 2158A, “Clothes Dryer Transition Duct”, an approved standard for flexible, high-temperature transition ducts, rated to 430 °F., for both electric and gas dryers (this standard is also part of IRC M1502.4.3 and IMC 504.8.3)

The transition duct is a flexible duct that connects the back of the dryer to the exhaust vent in the exterior wall. The requirements for transition ducts are as follows:

Must be a single length connecting sections disallowed
Can’t be concealed within construction, such as passing through floors, walls, hidden spaces, etc., or be longer than 8 feet
Only flexible ductwork listed, labeled, and in compliance with UL 2158A can be used

Types of Transition Ducts