This addendum clarifies and adds requirements related to
indoor humidity and the building envelope as they relate to
potential indoor air quality problems. Among other changes, it
revises the humidity control requirements currently described
in Section 5.10 by modifying the upper relative humidity limit
and eliminating the lower limit. A lower humidity limit is no
longer included because the data supporting such a limit are
very limited and not entirely consistent. An upper relative
humidity limit is now a design requirement (not simply a recommendation
as in the current standard) for mechanical systems
with dehumidifying devices and controls since high
indoor relative humidity in conditioned spaces has been associated
with conditions that can lead to microbial growth.
Building pressurization requirements to minimize the infiltration
of moist outdoor air (which can cause condensation on
building surfaces during cooling operation) have also been
added. In addition, the issue of condensation on cold interior
surfaces and contaminant transport from attached parking
garages is addressed.
| ANSI : | ANSI Approved |
| File Size : | 1
file
, 120 KB |
| Note : | This product is unavailable in Russia, Belarus |
| Published : | 2003 |
