The sequential box model is a versatile and easy-to-use method to estimate both instantaneous and steady-state concentrations at arbitrary points inside a complex enclosure. This model is used to predict vapour concentrations experienced by workers spraying a coating inside a storage vessel. Also, it accommodates the generation of vapour and local air circulation that vary with time and location as the worker moves about inside the confined space.

KEYWORDS: calculating, transient, solvents, steady state, content, personnel, spraying, air movement, hazards