MIL-HDBK-1003/3
2.2.4.1
General. Combine ventilation equipment for the heating
system with ventilation equipment for the cooling system wherever
feasible. Use positive methods to ensure adequate ventilation
air for IAQ at occupied operating modes.
2.2.4.2
Humid Climates. Independent ventilation systems are
required in humid climates for humidity control. Refer to
MIL-HDBK-1011/1, Tropical Engineering.
2.2.4.3
Engineered Smoke Control System. Use of smoke control
systems should be limited to high rise structures such as
hospitals. For detailed information on engineered smoke control
systems, refer to ASHRAE Publication, Design of Smoke Control
Systems for Buildings, and ASHRAE Handbook, HVAC Systems and
Applications, and NFPA 92A, Smoke Control Systems. Refer to
Appendix B for notes on design of smoke control systems.
2.2.5
Humidification Equipment
2.2.5.1
General. Provide humidification systems when outdoor
design conditions would result in an interior space relative
humidity less than 20 percent. Combine humidification equipment
with HVAC systems when central station air handling equipment is
used. Ensure that the building can contain the added moisture
without damage. Refer to MIL-HDBK-1191, Medical and Dental
Treatment Facilities Design and Construction for medical
facilities requirements.
2.2.5.2
Steam Humidifiers. Use of direct steam containing
amines is prohibited. Provide moisture eliminators if heated pan
humidifiers are used with high pressure steam as a heating
source. Makeup water for pan humidifiers should be from a soft
water source if available to minimize scaling. Automatic
blowdown should be provided on heated pan humidifiers to reduce
scaling.
2.2.5.3
Atomizing Humidifiers. Do not use atomizing
humidifiers as an alternative to direct steam or heated pan type
since these have the potential of injecting the legionnaire
bacillus as well as other pathogenic microorganisms into the air
distribution system.
2.2.6
Temperature Controls
2.2.6.1
General. Design control systems as simple as possible,
reducing complexity to only that required to meet design
conditions and to provide safe operation. Integrate limit and
safety controls as part of the system. Section 8 provides
additional general information on control systems.
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