Exhaust flue set screw

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Bunny Laroche

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Hello, there is a small port on our Westinghouse 80k BTUh boiler's exhaust port that has a sealed plastic set screw that does in fact unscrew all the way out, exposing a small hole in the exhaust pipe immediately above the boiler. Is this small exposed hole intended as a convenient point where a combustion analysis can be measured after the boiler has its gas turned on and is fire up?
 
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Hey, wait a minute.

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