The Lennox X4221 (catalog 6726L) is a rectangular, side-mount zone damper engineered to provide precise airflow control in residential and light commercial HVAC zoning systems. Designed for durability and smooth operation, this 18 x 8 inch damper helps optimize comfort by regulating conditioned air delivery across multiple zones. The side-mount configuration allows easy installation in tight duct runs, while the precision-fitted blade and frame enhance system efficiency and reduce air leakage.

This Lennox OEM zone damper is ideal for new installations or replacement applications where reliable airflow management is essential. Built to meet Lennox performance standards, it integrates seamlessly with compatible Lennox zoning equipment and control systems.

 

Key Features:

• OEM Lennox rectangular zone damper
• 18" x 8" duct size
• Side-mount configuration for flexible installation
• Enhances airflow balance and zoning efficiency
• Durable construction for long service life
• Compatible with Lennox zoning components and controls
• Ideal for residential and light commercial HVAC systems

 

Technical Specifications:

• Part Number: X4221
• Catalog Number: 6726L
• Damper Type: Rectangular, Side Mount
• Size: 18 Inch x 8 Inch
• Application: Airflow control in multi-zone HVAC systems