When is it
necessary to provide building exhaust? Whenever an outdoor air
economizer is used, a building generally
requires an exhaust system. The purpose of the exhaust system is
to exhaust the proper amount of air to prevent over orunderpressurization of the building. The goal is to
exhaust approximately 10 percent less air than the amount of
outside air going into the building. This maintains a slightly
positive building pressure.
A
building may have all or part of its exhaust system in the
rooftop unit. Often, a building provides exhaust external tothe air conditioning equipment. This external exhaust
must be considered when selecting the rooftop exhaust system.
IntelliPak™ Rooftop units offer four types of exhaust systems:
- 100 percent modulating exhaust with Statitrac™ direct space
sensing building pressurization control (with or withoutvariable frequency drives).
- 100 percent modulating exhaust without Statitrac.
