It has been determined from extensive
testing conducted between May 1987 and May
1988, in the hot and humid climate of
central Florida, that pressure differences
within the envelope of residential housing
exists. These can range from near neutral
to pressures, either positive or negative,
as great as 0.24" W.C. (60 pascals).
Reasons sighted and discussed in this paper
include duct system design, duct system
failure, airtightness of the residence and
human interactions. This testing further
reveals that one of the largest driving
forces in air change rates can be attributed
to mechanically induced infiltration and
exfiltration. Airtightness can also
drastically affect this pressure difference
within the envelope.
In conclusion, the effects of these
pressure differentials on energy
consumption, indoor air quality, comfort,
and degradation of building materials will
be discussed. Possible solutions and
practical field test protocol to correct
these ill effects both in new and existing
residential housing will be covered
