Modified and controlled relative humidity in buildings for certain occupancies is discussed. New criteria are used in determining the needs, desirability and problems associated with humidities in a building. Severe winter climate requires that special attention be given to the problems associated with increased indoor humidities during cold…

Discusses key factors to be considered by local educational authorities in creating a healthful -- and consequently constructive -- environment in the school building for students, teachers, and administrators. Focuses on ventilation, air cleaning, and humidification. (EA)