36 C.F.R. § 1230.20 How should microform records be stored?
Title 36 - Parks, Forests, and Public Property
(a) Permanent and unscheduled records. Store permanent and unscheduled microform records under the extended term storage conditions specified in ISO 18911:2000 and ANSI/PIMA IT9.2–1998, except that the relative humidity of the storage area must be a constant 35 percent RH, plus or minus 5 percent. Do not store non-silver copies of microforms in the same storage area as silver gelatin originals or duplicate copies. (b) Temporary records. Store temporary microform records under conditions that will ensure their preservation for their full retention period. Agencies may consult Life Expectance (LE) guidelines in ANSI/AIIM standards (see §1230.3 for availability) for measures that can be used to meet retention requirements.
Title 36: Parks, Forests, and Public Property
PART 1230—MICROGRAPHIC RECORDS MANAGEMENT
Subpart D—Storage, Use and Disposition Standards for Microform Records
§ 1230.20 How should microform records be stored?
