What kind of ducting system do you recommend?

Many different materials are acceptable for the natatorium environment; whatever materials are used must be resistant to corrosion and discoloration caused by exposure to chlorine compounds, moisture and light. Consider using a fabric duct system for the distribution of supply air to the natatorium perimeter. These competitively priced, popular ducting systems are supplied in a variety of colorfast polyester materials and with stainless steel hanging hardware that will add style and value to your indoor pool for its service lifetime. Systems should be designed to ensure good distribution, wash windows with dry conditioned air to minimize condensation, avoid cold drafts on the pool deck and minimize air movement across the water surface (which would in turn increase evaporation and humidity loads).