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There is a lot of equipment in the Mechanical Room:
4 furnaces, 3 air conditioners, 1 air-to-air exchange,
2 hot water heaters, 1 indoor air circulation system,
2 water pumps, 1 water softener,
network switches, telephone exchange, alarm system,
and probably more we don't know about yet. These pipes
are the intakes and exhausts for most of that equipment.
Since the heat-generating equipment is very efficient,
the exhausts can be PVC pipe.
This duct work takes up a corner of the Pantry. Other
venting will join with this above the ceiling so we
will have only one roof penetration on this end of the
house.
Note: the curvature of the studs is an illusion due to
the close-up lens.
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