...an air temperature of 65-68 degrees Fahrenheit at shoulder height for kindergarten and primary-grade students, and of 68- 0 degrees for older students, is healthful and comfortable. Convection causes air temperatures to vary with height in any given space. The difference in temperature between the floor and the 5-foot level should not vary by more than 3 degrees Fahrenheit. The relative humidity in a space for learning strongly influences the comfort of the individual. The comfort index varies with respect to both temperature and humidity. At temperatures of about 72 degrees Fahrenheit, a relative humidity of 60 percent is quite acceptable. As air temperatures rise , however, the relative humidity should decrease if comfort is to be maintained...keep the humidity in the vicinity of 40 percent.
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