archival storage conditions
n.
An environment suitable for the protection of materials from hazards such as theft, fire, flood, particulates, pests, or vandalism, and from extremes or fluctuations in temperature, relative humidity, or light.
Notes
The phrase is used generally for areas with environmental controls specifically engineered for the protection of the materials, as distinguished from areas without environmental controls (attics, storage sheds) or with controls appropriate to other considerations (the comfort of office workers). No single standard defines an ideal archival environment, and different types of materials may require different conditions.