Williams 12B40 Observation Door 321894-709 Common Technical Questions How do

Common Technical Questions How do I omit certain days from the timer's schedule

for safety and technical accuracy

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Is the pressure switch included with the 11K98 assembly

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Williams 12B40 Observation Door 321894-709 Common Technical Questions How doThe Williams 12B40 Observation Door is a critical OEM replacement part designed for high performance direct vent and gravity fed wall furnaces. This assembly, also commonly referred to as a peep hole cover assembly, provides technicians with a secure access point to monitor the pilot flame and combustion status without compromising the envelope of the combustion chamber. Engineered for a precise fit, the kit includes the durable observation door, a