Nitrate gases have the same destructive effect on all films exposed to it and stored in the same room, not just the film emitting the gases; therefore, nitrate-based films are preserved in a separate building or space than acetate-based films. Storage buildings should never be situated in densely populated areas because of the fire hazard and toxic gases. It is also recommended that the buildings be painted white or are of a light color to reflect heat. Permanent preservation demands buildings with appropriate storage facilities that maintain specified levels of temperature and humidity. Optimal air conditions are: low temperatures of -2 degrees Celsius +/- 2 degrees, relative humidity of 40-60%, and 25% supply of fresh air.

 

Measures for fire prevention, suppression, and containment, are crucial. Although nitrate fires can not be extinguished with water, sprinkler installations and designated fire-rated partitions help confine a fire to where it started. In regards to ventilation, pressure operated blast vents release the pressure of the very rapidly forming gases of combustion into the open air. An opening of 6 square feet is advised for areas storing 1000 reels.