Specifications

13
INDOOR AIR QUALITY
minimum exhaust air CFM requirements are
identical for all systems.
Some promote more outdoor air than codes
require in order to ensure good IAQ. This
approach does not actually guarantee better
air quality but it certainly increases building
operating costs. If the air distribution is not
done correctly and the conditioned air does
not get to the breathing zone, no amount
of outside is going to help. A more cost
effective solution is to address the chemical
issues directly and adhere to the ASHRAE
guidelines (or whatever your local code
minimum requirements are) while ensuring
most importantly that air distribution is
correct.
System comparisons and features are highlighted in
table 4. Note: The table assumes all units are designed
with the same options airside characteristics.
Wa
ter
Table 4 – System Comparison
Indoor Air Quality
Good indoor air quality can be a challenge in an indoor
pool. However, designers that follow ASHRAE guidelines
as well as those recommended in this manual should
have every expectation of a great space condition
and pleasant overall experience for the patrons of the
facility. There are steps a design engineer must take
in their design to minimize the chances that a patron
experiences a foul smelling pool odor and stinging
eyes. There are many factors that impact the IAQ in a
natatorium: pool water chemistry problems, inadequate
outdoor air, air stagnation, poor air distribution, high
humidity, mold, mildew, condensation and corrosion.
Four of the five key factors having the most
direct impact on Indoor Air Quality (IAQ) are
under the control of the design engineer.
• Pool water chemistry
• Poor air distribution: No Airflow in the Breathing Zone.
• Outdoor air ventilation
• Exhaust air
• Air change rate
A properly designed facility will adequately
control and remove chloramines while
providing the treated and conditioned air to
where it is most needed – into the breathing
zone and deck area.
Pool Water Chemistry
Pool Water Chemistry is one key variable that
impacts IAQ that is not under the control of the design
engineer.
Good pool water chemistry is critical in order to
achieve levels of human comfort and health. Also by
maintaining optimal pool water conditions you will have
the best possible indoor air quality and ensure optimal
performance from the mechanical system.
The good news is that there are terrific new technologies
available to owners to help with water chemistry and
chloramine management. It is recommend that the
reader discuss this with the owner to help establish
what will be done water side to help ensure the facility
will have good air quality.
Poor water chemistry is the single biggest source
of indoor air pollution and corrosion problems in a
natatorium. Paddock’s Evacuator System as well as UV
treatment systems are essential considerations to help
ensure good IAQ.