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this model is strictly for single-stage 1H/1C systems
preventing sagging or vibration-induced failure in high-velocity environments
the Lennox 12F19 is the current catalog number and is functionally identical to the 12F1901 flame sensor
It is not designed for continuous pressure and should not be pressurized for more than 12 hours in any 24-hour period
Fenwal 11-030000-000 Thermoswitch Els PW 17895 this model is strictly forThe Fenwal 11 030000 000 Thermoswitch is a precision engineered surface mount temperature controller designed for rapid response in demanding industrial and commercial thermal systems. Utilizing the principle of differential expansion of metals, this unit features a stainless steel outer case that expands at a specific rate relative to the internal bridge assembly. Because the housing is in direct contact with the heated surface, the 11 030000 000
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