Slant Fin 412-707-040 Vent Damper

The Slant Fin 412-707-040 is a heavy-duty 7" automatic vent damper engineered for precision airflow management in hydronic heating systems. Constructed with high-grade galvanized steel, this 7-inch vent damper is designed to integrate seamlessly into standard round flue piping for specific Slant Fin gas-fired boilers. When the system is off, the motorized flue damper closes securely to prevent standby heat loss—a critical factor for contractors looking to maximize gas boiler efficiency and prevent chimney backdrafts.

This unit features a power-open/power-close mechanism driven by a 24V motor, ensuring that the automatic vent damper only allows combustion gases to escape when the burner is firing. For technicians, the Slant Fin 412-707-040 provides a visible position indicator and is compatible with existing Slant Fin wire harnesses, specializing in quick field replacements on Galaxy and Sentinel series boilers. Proper installation of this replacement HVAC damper maintains the safety circuit's integrity, preventing the unit from firing until the damper is fully open.

• Reduced Off-Cycle Heat Loss: Seals the flue when the burner is idle to retain heat within the heat exchanger.
• Enhanced System Safety: Interlocks with the boiler’s safety controls to ensure the damper is in the open position before ignition.
• Durable Steel Construction: Built to withstand high-temperature flue environments without warping or losing seal integrity.
• Direct OEM Fit: Specifically calibrated for Slant Fin 7-inch venting applications to minimize field modifications.

Does this damper work with all boiler types?
No, this unit is design-certified specifically for Slant Fin gas boilers. You must verify the boiler nameplate to ensure compatibility with the 412-707-040 part number before installation.

Can I install this 7-inch vent damper horizontally?
Yes, this model supports both vertical and horizontal installation, provided there is a minimum 6-inch clearance from combustible materials and the motor operator is not placed directly above or below the pipe to avoid heat or condensation damage.

What happens if the damper motor fails?
The safety circuit prevents the burner from firing if the blades fail to reach the open position, protecting the mechanical room from combustion byproduct accumulation. Regular inspection by a technician is recommended to verify gear train and leaf movement.

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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.