Natatorium Dehumidification Selection Guide

Dehumidification Unit Selection Form

Please use this form to obtain engineered equipment selections for units serving spaces with indoor swimming pools, saunas, fitness centers, natatoriums, or other high humidity installations.  Please estimate values as closely as possible, the more information provided the more accurate the selection for your project.  Please indicate if this is a replacement of a PoolPak, Seresco, Dectron, Desert Aire, or another system.  If you have questions please feel free to contact our engineering support at (212) 920-4878.

Natatorium Dehumidification Unit Selection Form

Activity Factor

Number of Indoor Pools

15 + 7 =

Additional Design Considerations

  1. Make sure to get operating conditions in written form from the end user (pool water temperatures and room air temperature).
  2. System supply CFM delivers 4-6 air changes per hour.  The room volume dictates the supply CFM.  Ensure that supply air gets to the ‘breathing zone.’ Return duct location compliments supply duct.  The supply and return ducts are not short circuited.
  3. Outdoor air CFM per ASHRAE standard 62.  Baseline of 0.48 CFM/sq. ft of water and wet deck for regular pools. Add 7.5 CFM per spectator, swimmers are not considered in the baseline calculation.
  4. The room is at a slightly negative air pressure (0.05 – 0.15 inches of water column).  110% of outside air is generally recommended.  Is there source capture onsite? Is there an evacuator system onsite?  Is exhaust air drawn from above high activity areas within the pool space.
  5. Latent loads for pools, outside, and spectators.  Sensible cooling and heating loads are calculated for the space design temperature.
  6. Are vapor barriers on the warm side of the dew point temperature in all walls, floors, and ceilings? Are all windows, doors, and skylights fully blanketed with 3-5 CFM of supply air?
  7. Consider the ASHRAE 90.1 Energy Standard. Heat energy recovery between the minimum outside air and minimum exhaust air.  Can you do condensate reclamation? System refrigerant charge reduction – fluid cooled design.
  8. Consider the swim meet mode. What is the total number of spectators and competitors? The spectator area needs 6-8 air changes and may need a microclimate to maintain comfortable conditions.
  9. Ensure service and maintenance with internet monitoring, the unit is accessible, and have adequate service clearance.


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