Slant Fin 412-706-040 Vent Damper

The Slant Fin 412-706-040 Vent Damper is a 6-inch automatic vent damper designed to optimize the efficiency of residential gas-fired boilers. As a critical safety and efficiency component, this motorized flue damper prevents thermal siphoning by sealing the vent pipe during the burner's off-cycle, retaining heat within the heat exchanger. This unit is specifically engineered for Slant Fin boiler models like the Sentry (S-series), Sentinel (SE-series), and Galaxy, provided the boiler’s rating plate specifies compatibility with this OEM part number. Constructed from heavy-gauge, corrosion-resistant steel, the vent damper 6 inch assembly ensures reliable performance in high-temperature flue environments. It integrates directly into the 24V safety control circuit via a standardized wiring harness, ensuring the burner cannot fire unless the damper vane is in the fully open position. For professional contractors, this HVAC vent damper serves as a direct replacement for failing units, restoring system AFUE ratings and preventing dangerous flue gas spillage.

• Thermal Retention: Minimizes standby heat loss by closing the flue when the burner is idle.
• Safety Interlock: Features a proven end-switch mechanism that prevents ignition if the damper remains closed.
• OEM Compatibility: Specifically designed for seamless integration with Slant Fin gas boilers under 300,000 BTU/hr.
• Durable Construction: Built with high-grade stainless steel to resist corrosive combustion byproducts.
• Energy Efficiency: Helps maintain building pressure and reduces fuel consumption by eliminating the "chimney effect."

• Can I install this on a boiler larger than 300,000 BTU/hr? Per technical guidelines, this specific model is typically intended for boilers under this threshold; always verify the specific requirement on the boiler’s data plate before installation.
• What should I do if the burner won't fire? Check the damper motor's status; if the vane hasn't reached the full-open position, the safety circuit will remain broken to prevent flue gas backup.
• Is a wiring harness included? While often sold as a "damper only" component for replacement, check the existing harness for terminal wear or corrosion before reuse.

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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.