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1949
FILM VAULTS
197
SHELF STORAGE — SECONDARY PROTECTION
If the custodian does not want to take the risks inherent in openrack storage (just described), two solutions to his problem are suggested: (1) shelf storage for films of secondary values and (2) cabinet storage for films of primary values. Both shelf and cabinet storage, designed by the author several years ago, may be found in the National Archives Building, Washington, D. C., but are discussed here with certain improvements suggested.
In the case of shelf storage, the cans are stored flat to prevent damage from water. The upright partitions are increased in number
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Fig. 1 — Side-view elevation. A, flue to exterior; B, ceiling or roof line; C, sprinkler heads; D, floor.
from one every 36 inches (open-rack storage) to one approximately every 12 inches; that is, one for each tier of film cans. Such proximity of partitions limits the unit load involved in the horizontal spread of fire. (See Fig. 1.) The shelves are solid with a maximum of heat resistance and a minimum of heat conductivity and serve as insulators against a vertical spread of fire. (See Fig. 2.)
NOTE : In some instances where horizontal storage has been adopted, the cans rest on short flanges that are anchored to the sides of the upright partitions. In such a case it is argued that the use of such flanges, instead of solid shelves, allows the water from the sprinkler heads to reach each can in full volume. It should be pointed out, however, that water by itself may not prevent a spread of a nitrate