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It is absolutely essential that hydronic heating system hot water piping be kept free of air. Assuming that a system is initially properly filled with water, what is the primary source of air contamination?
A) The introduction of air with the convector steam supply.
B) The introduction of air via the makeup water.
C) The introduction of air via the expansion tank vent.
D) The introduction of air via the atmospheric drains tank vent.
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