Which of the following is NOT a storage requirement for files?

Allowing direct sunlight exposure is not a storage requirement for files and is actually detrimental to their preservation. Direct sunlight can cause significant damage to documents over time, leading to fading, discoloration, and deterioration of the materials. In contrast, the other options provide essential practices that help ensure the longevity and integrity of files.

Controlling excessive fluctuations in temperature and humidity is crucial because both high heat and high humidity can lead to mold growth, warping, or other physical damage. Wrapping minute books in acid-free paper for flat storage protects them from the damaging effects of acids present in many types of paper and helps maintain their structure. Preventing contamination by dust or other pollutants is important because these materials can cause degradation and are often difficult to remove from documents once they settle on surfaces. Collectively, these practices are vital for proper file storage and preservation, unlike exposure to direct sunlight.