Storage of original microfilm must be stored in a separate building from that which duplicate copies, if any, or the original records are housed. All original microfilm must be handled microfilmed records with a retention period exceeding ten years must be stored in a temperature that does not exceed 70 degrees Fahrenheit, and a constant relative humidity of 35% must be maintained with a maximum variance of +/- 5.0% relative humidity in a 24-hour period.

A typical air-conditioned office environment with stable temperature and humidity where microfilm will have minimum exposure to light and contaminants, is generally adequate for film to be retained for ten years or less.