I found a half teaspoon of black gritty sediment in the condensate trap. It looked a bit like coarse black pepper. Is this a normal combustion byproduct or possibly due to dirt or dust in the air near the vent? I live on a state highway with lots of truck traffic. I have to power wash the house at least every other year because of the black dirt that accumulates on the white siding. The concentric vent is on the side of the house not facing the highway. The boiler has been in continuous service for 11 months and burned 730 ccf NG.
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