Smith 100109721 Upper Probe is a critical OEM replacement part engineered for the inner control assembly of high-efficiency commercial water heaters

the Resideo Q3451B1004/B is specifically configured for natural gas with the BCR-18 orifice

maintaining alignment under continuous load

meaning it will close the circuit and resume operation once the internal components cool down by approximately 40 degrees

Are mounting fasteners included with this hinge

Resideo ZD14X6TZ Damper R-448A Smith 100109721 Upper Probe isThe Resideo ZD14X6TZ Damper is a professional grade 14x6 zone damper engineered for precision airflow management in HVAC zoning systems. Featuring a robust parallel blade design, this rectangular zone damper ensures high efficiency performance with less than 1% leakage at 0. 5 in. WC. The unit is driven by a reliable 24V synchronous motor mounted on the 6 inch side, utilizing power closed spring return open logic. This fail safe configuration makes it