Whatever may be the industrial manufacturer, good practices always require
eliminating unintentional holes in buildings and keeping doors and windows
closed, avoiding the storage of odorous materials outside the building and the
transport of materials between buildings in open containers, and so on. Containment
of highly odorous process gases, i.e., keeping it separate from less
odorous streams, may reduce the capital and operating costs of the required
abatement system(s). As a general rule all odor control systems should exert
a negative pressure locally or within process buildings to prevent odorous air
leaking out