Facility Profile - May 2014
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The Air in There
Jenks Trojan Aquatic Center in Jenks, Okla.

The exhaust air contribution from the chloramines source capture/exhaust system, must be factored into the building's overall negative pressurization, which is a critical design criteria in all natatoriums. While it can exhaust independently of the dehumidifiers, the project saved significant equipment costs because the chloramines source capture/exhaust system is ducted to fans in the dehumidifier units, which carefully monitor and control the entire building pressurization status via their Command Center microprocessors.

Equally important is positioning the chloramines source capture/exhaust system at the pool edge nearest the natatorium's return air grille, which helps draw chloramines toward the evacuation system. Pool builder KC Gunite Inc., Belton, Mo., installed the 174 x 75-foot pool, pool equipment, gutter system and the chloramines source capture/exhaust system.

Even though chloramines reduction will extend the facility's lifecycle longer than most indoor pools, KSQ Architects' design team still cautiously chose materials that withstand the hostile environments of natatoriums. The entire pool surface is tiled instead of plastered, for example. And many square feet of wall surface use porcelain wall coverings, that resist corrosion and coordinate with the pool tile texture.

SHW Group's ventilation design also maintains a comfortable environment in the 1,200-seat spectator section. The dehumidifiers condition the area for typical daily use, but in the event of heavily attended swim meets, the HVAC system also activates a conventional make-up air package unit that functions as a backup when temperature or carbon dioxide target levels can't be maintained during full occupancy.

Another integral part of the superior ventilation design is white Sedona-Xm premium textile HVAC duct, which has an antimicrobial agent built into the material to minimize the harboring of biological contaminants that commonly occur in natatorium metal ductwork. The main pool area has four runs of 54-inch-diameter duct each with two airflow devices for adjusting air distribution inside the duct. The linear array of vents span the entire length and ensure an even and gentle distribution. The factory-engineered Comfort-Flow air dispersion porosity allows a small percentage of air to flow through the fabric to eliminate dust buildup and condensation. The spectator area uses 42-inch-diameter duct from its dedicated HVAC system.

With a heavily attended meet such as the Speedo Championships, the JTAC proved it is a role model with a design that should be considered in all new and retrofitted natatoriums.

"The IAQ was the best I've ever seen at a major swimming competition; there were no signs of coughing, burning eyes and the environment was comfortable for swimmers and spectators alike," said Villarreal.

Seresco USA Inc.: www.serescodehumidifiers.com
Paddock Pool Equipment: www.paddockindustries.com
Jenks Public Schools: www.jenksps.org