5" Vent Damper Assembly

The Weil-McLain 381-800-475 Automatic Vent Damper Assembly is an OEM control component engineered for efficient flue gas management in gas-fired boiler systems. Designed for compatibility with multiple Weil-McLain boiler series, this 5-inch damper assembly includes the factory wiring harness and is built to meet performance and safety requirements for automated vent control in heating applications.

Details

• Model Number: 381-800-475
• Manufacturer: Weil-McLain
• Product Type: Automatic Vent Damper Assembly
• Manufacturer Part Number (MPN): 17118
• Diameter: 5 inches
• Includes: Factory wiring harness and actuator assembly
• Application: Automatic flue gas control for gas-fired boiler systems
• Compatible Models: CGa-4, EG, CG-4, and CGx-4 Series Boilers
• Function: Reduces standby heat loss by automatically closing the vent during non-firing cycles

Technical Specifications

• Operating Voltage: 24 VAC control circuit
• Control Type: Motorized damper with end-switch feedback
• Construction: Galvanized steel damper body with precision-fit actuator
• Connection: Integrated electrical harness for plug-in installation
• Diameter: 5 inches nominal flue size
• Operation: Opens automatically during burner operation and closes upon shutdown
• Mounting Orientation: Vertical or horizontal flue position as per boiler specification
• Compliance: Meets OEM design standards and applicable ANSI safety requirements
• Replacement Use: Direct OEM replacement for existing vent damper assemblies on compatible models

Summary

The Weil-McLain 381-800-475 Vent Damper Assembly (MPN 17118) provides automated flue control for CGa-4, EG, CG-4, and CGx-4 boilers. With a 5-inch diameter and factory-installed harness, it ensures proper integration with Weil-McLain control systems, optimizing combustion efficiency and minimizing standby losses in professional-grade heating installations.