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If your spring is corroded or broken
While the 700 series is versatile
it features a standardized 1/2" NPT connection
If the boiler is throwing a "no flame signal" error despite a clean sensor
BROAN-NuTone S97018398 Top Cover Assy 321042-401 If your spring is corrodedThe BROAN NuTone S97018398 Top Cover Assy is a critical OEM replacement component designed to maintain the structural integrity and airflow efficiency of localized exhaust systems. This Broan motor cover assembly is specifically engineered for compatibility with select ventilation fans, ensuring a precise fit that prevents vibration and manages static pressure within the housing. As a direct genuine NuTone replacement part, it replaces worn or damaged
