The containers of film throughout its lifespan are not limited to what one typically considers a container, such as a barrel or can; in this analysis a container is defined as any enclosed spatial condition that pays particular attention to tempering and regulating a desired environmental effect. The scale of the container spans from the vast spaces of warehouse floors to the projection rooms of theaters, to vaults, to individual cans. All of these circumstances respond to the requirements of film throughout different stages of its use, prior to and long after exposure, as a result of the material's chemical compostition and physical properties and dimensions. While air conditions are not explicitly detailed in each form of containment, it should be noted that air conditions- temperature, humidity, flow, and cleanliness -are always primary concerns in dealing with cellulose-nitrate film.