This addendum adds requirements
to ensure that the air distribution system is capable of
delivering outdoor air to the occupied spaces. In systems with
AC units, heat pumps, or fan-coil units mounted in the ceiling
or floor plenum, ventilation air is often supplied to the plenum
to mix with recirculated air. Where outdoor air is poorly
distributed in such systems, units that are far from the outdoor
air supply to the plenum may not receive the intended levels of
outdoor air. In any air distribution system, required airflow
can only be assured by measuring actual airflow and adjusting
dampers and orifices to account for the effect of as-installed
duct pressure drops, i.e., the system must be balanced. Designers
must consider and make provision for system balancing.
Note that balancing is addressed in terms of designing the
system so that it can be balanced; this addendum does not
require balancing at any particular time, as that issue is
covered in other addenda. Also, note that balancing is not a
one-time event but must be reevaluated over time as indicated
in other sections of the standard.
| ANSI : | ANSI Approved |
| File Size : | 1
file
, 400 KB |
| Note : | This product is unavailable in Russia, Belarus |
| Published : | 2002 |
