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The various elements of environmental control for electrical equipment rooms, motor rooms, and control rooms are discussed. Positive pressurization, air filtration, ventilating systems, fans, air conditioning, and air control devices are described, including design considerations and economic comparisons of equipment and systems currently available. Data comparing efficiencies, first cost, and maintenance requirements of air filtration systems are included. Ground rules are provided for comparing ventilation systems with air cooling systems for specific installations and for choosing between the various types of air cooling systems.