The Lennox X4239 rectangular zone damper is designed for precise airflow control in HVAC zoning systems. Featuring a 12 inch x 12 inch rectangular opening and a side mount configuration, this damper allows installers to effectively regulate air distribution between multiple zones, improving comfort, system efficiency, and temperature balance throughout the building. It is engineered for reliable operation with Lennox zoning applications and is suitable for both residential and light commercial HVAC systems.

This zone damper helps reduce hot and cold spots by directing conditioned air only where it is needed. Its durable construction supports long service life and consistent performance in forced air heating and cooling systems.

 

Key features:

Rectangular zone damper for HVAC zoning systems
Side mount design for flexible ductwork installation
12 inch x 12 inch opening size
Designed for accurate airflow control and zone balancing
Helps improve comfort and system efficiency
Compatible with Lennox zoning applications

 

Specifications:

Brand: Lennox
Part number: X4239
Alternate / reference number: 6743L
Damper type: Rectangular zone damper
Mounting style: Side mount
Nominal size: 12 in x 12 in
Application: HVAC zoning systems

 

Typical applications:

Residential forced air heating and cooling systems
Multi zone HVAC systems
Light commercial HVAC zoning