DEPARTMENT OF THE ARMY
ETL 1110-1-180
CEMP-ET
U.S. Army Corps of Engineers
Washington, D.C. 20314-1000
Technical Letter
No. 1110-1-180
29 August 1997
Engineering and Design
HUMIDITY AND CORROSION CONTROL FOR NATATORIUMS
1. Purpose. This letter provides additional design guidance for the proper heating, ventilating
and air conditioning design of natatoriums.
2. Applicability. This letter applies to all HQUSACE elements and USACE commands having
Army or Air Force military construction and design responsibility.
3. References.
a. TM 5-810-1, Mechanical Design Heating, Ventilating and Air Conditioning.
b. Architectural and Engineering Instructions, Appendix D.
c. American Society of Heating, Refrigeration and Air Conditioning Engineers, ASHRAE,
1991 Applications Handbook, "NATATORIUMS," 1791 Tullie Circle, NE, Atlanta, GA 30329.
d. AIR CONDITIONING, HEATING & REFRIGERATION NEWS, June 23, 1997,
"Dehumidification of Indoor Pool," Business News Publishing Company, P.O. Box 2600, Troy,
MI 48007.
4. Distribution. Approved for Public Release, distribution is unlimited.
5. Discussion. Humidity and corrosion continue to be a problem with newly constructed and
renovated natatoriums. Additional guidance would be beneficial in preventing these damaging
environmental conditions.
6. Action. Compliance with the Architectural and Engineering Instructions, TM 5-810-1, the
latest American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE)
guidelines, and the following advice will provide effective humidity and corrosion control for
interior pool spaces.
a. Roof structural elements. Structural members that are continuous from the exterior to the
interior of the building should be avoided. Such roof penetrations are difficult to seal air tight and
insulating the structural element itself is difficult and often ineffective. As a result, the part
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