The smoke extractor inlet of the heating furnace forced draft system is equipped with an observation window. But water and a white substance precipitated from the observation window
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What are water and white things? Has this phenomenon been observed? Asked for advice
The water must be steam generated by the combustion of gas, which then cools down at the window area. The white substance is probably crystalline salt; could it be that salts contained in the fuel oil have crystallized?
Water is used to cool the smoke; the white substance is probably salt
Sour water contains a high amount of sulfuric acid; it should be salt. We have them all after opening our flues
Observation window? Could you give me a picture of the observation window?