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pressure switch stuck open
High-Temperature Durability: Constructed with materials designed to withstand recurring thermal stress without degrading the signal to the ignition module
Verify your original part number or specific furnace model compatibility with a technician before installation
Always verify your header material and ID dimensions before starting the repair
Contractor-Ready Design: Standard wiring leads and bolt patterns facilitate rapid installations
Slant Fin 412-705-040 Damper Assembly 30067439-890 pressure switch stuck openThe Slant Fin 412 705 040 is a heavy duty 5 inch automatic vent damper assembly engineered specifically for high efficiency hydronic heating systems. Designed as a direct replacement component, this motorized flue damper prevents standby heat loss by sealing the vent pipe when the burner is not firing, significantly improving the AFUE rating of the boiler. This assembly features a robust internal synchronous motor and built in safety interlock