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The B-suffix (like this X22440B3B) is designed for external equalizer setups
Honeywell 4074EVK Short Shaft Kit
high-velocity environments of the plenum while maintaining calibrated accuracy
preventing localized boiling or bypass leaks that can lead to catastrophic unit failure
Rheem-Ruud SP20172 Sensor Kit The B-suffix (like this X22440B3B)The Rheem Ruud SP20172 Sensor Kit is the essential OEM replacement for managing flammable vapor ignition resistance (FVIR) in gas fired water heaters. Designed as a direct supersession for AP13447 3, this flammable vapor sensor (FVS) monitors the environment for volatile substances, triggering a safe shutdown via the gas control valve if high concentrations are detected. A common indicator for a malfunctioning or tripped sensor is the seven flash
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