This standard is designed so that the user is required to select specific limits for a particular exhibition situation. A number of options may be used to meet the standard. This choice will depend in part on (a) the types, characteristics and condition of material being exhibited, (b) local climatic conditions, (c) considerations of human comfort, (d) available technology for environmental control systems, (e) constraints of existing exhibition areas and exhibit cases, and (f) cost considerations. The limits chosen should fall within the range of limits recommended in the standard.