Utica-Dunkirk 240006939 Vent Damper

The Utica-Dunkirk 240006939 is a 7-inch automatic vent damper engineered for gas-fired atmospheric boilers and furnaces to prevent standby heat loss. This electro-mechanical flue damper utilizes a 24VAC synchronous motor and a specialized damper blade actuator to seal the venting system when the burner is off, effectively maintaining boiler water temperature and improving Seasonal Energy Efficiency Ratio (SEER) ratings. Designed as a direct OEM replacement part for ECR International brands, it features a standardized low voltage wiring harness for seamless integration with existing safety interlocks. The heavy-gauge galvanized steel construction ensures durability against flue gas condensates, while the end switch verification ensures the burner cannot fire until the damper reaches the full open position. This 7" flue damper is essential for contractors performing system efficiency upgrades or replacing failed power dampers in mid-efficiency heating systems.

Key Technical Benefits

• Reduced Standby Loss: Closes the chimney flueway during off-cycles to retain residual heat within the heat exchanger.
• Proven Reliability: Features a high-torque actuator motor designed for high-cycle environments in residential and light commercial applications.
• Safety Interlock: Integrated dual-redundant end switches verify physical blade position before allowing the ignition sequence to proceed.
• Universal 7-Inch Fit: Precision-engineered for Utica and Dunkirk boiler models requiring a 7" vent diameter.
• Simplified Installation: Standard 4-pin or 5-pin molex connector compatibility for rapid field replacement by technicians.

Common Technician Questions

Can this damper be installed on an oil-fired system?
No, the 240006939 is specifically designed and certified for gas-fired atmospheric heating equipment only; oil-fired units require different materials and actuation speeds.

What should I check if the damper fails to open?
Verify 24VAC across the motor leads and inspect the wiring harness for continuity. If the internal end switch does not engage, the boiler control module will prevent the gas valve from opening.

Does this unit support vertical or horizontal installation?
This damper is typically rated for vertical or horizontal flue pipe transitions, provided the actuator motor is not positioned directly beneath the vent pipe to avoid condensation damage.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.