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1) Today's houses are more air
tight due to energy conserving measures. Consequently there is less fresh
air coming into a home and not as many pathways for stale or polluted air
to leave it. When fires and boilers are starved of the oxygen needed to
burn fuels completely, carbon monoxide is produced. Many newer houses are
so airtight that powered exhaust fans in the kitchen and bathroom can
overcome the draft in the boiler chimney and literally pull the toxic
gases into the living space.
2) The new high-efficiency gas
and oil boilers, when hooked up to existing flues, often do not perform at
an optimum level. The differences in performance create conditions that
allow combustion byproducts to more easily enter home living spaces.
3) The above conditions join a
number of older, on-going problems including damaged or deteriorating flue
liners, soot build-up, debris clogging the passageway, and animal or bird
nests obstructing chimney flues.
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