Some air sealing and insulation addition done

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Reference no: EM133825726

Question

Over the summer, a house had some air sealing and insulation addition done. The air leakage was not brought down too low. Normal conditions air leakage is still above 0.4 ACH. Once winter started and the heating system came on it now regularly has carbon monoxide levels reading from 9 ppm to as high as 40 ppm. This is a very dangerous situation for the occupants. The heating system is an atmospherically vented furnace in the basement. You immediately know the cause and can prescribe a solution. What is it?

The ducts are leaky on the supply side. Seal the supply side of the duct system. There is insufficient combustion air. Add dedicated supply air to the combustion zone. There must be insufficient total air exchange. Add some constantly running exhaust venting. There must be insufficient total air exchange. Add some constantly running supply venting. The ductwork on the return side is leaky. Seal the return ducts with mastic.

Reference no: EM133825726

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