Lennox X4242 (6746L) is a rectangular HVAC zone damper designed for precise airflow control in zoned forced-air heating and cooling systems. This side-mount damper measures 18 inch x 12 inch and is commonly used in residential and light commercial ductwork where accurate zoning improves comfort and system efficiency.

Manufactured by Lennox, this zone damper is built for dependable operation and long service life. The rectangular blade design allows smooth modulation of airflow, helping maintain consistent temperatures across multiple zones while reducing unnecessary system run time.

Product overview
The Lennox X4242 side-mount zone damper is engineered to integrate seamlessly into rectangular duct systems. It supports zoning control strategies that reduce energy waste by directing conditioned air only where it is needed. Ideal for new installations or direct replacement in Lennox-compatible zoning applications.

 

Key features:

• Rectangular zone damper for HVAC zoning systems
• Side-mount configuration for flexible installation
• 18 inch x 12 inch duct opening
• Helps balance airflow and improve temperature control
• Designed for residential and light commercial applications
• OEM Lennox part ensuring proper fit and performance

 

Applications: 

• Zoned forced-air heating systems
• Zoned central air conditioning systems
• Residential and light commercial HVAC ductwork
• Replacement or upgrade of existing rectangular zone dampers