Photographic printing may generate humidity (due to the process of solutions and wash baths), chemical fumes and heat from equipment and high temperature process solutions. This phenomenon is of special significance in relation to X-ray films in hospitals.

To achieve and maintain an acceptable working environment, such as to guarantee high quality in the printing and prevent the accumulation of charges on the films, the contaminated air must be extracted and clean and fresh air introduced into the processing rooms.

The conditions are also necessary to maintain correct functioning of photographic materials and equipment.

The photographic laboratory should be maintained at an ambient temperature of 20-22°C with a relative humidity of 50-60%.