ABSTRACT
The design of hoods and ductwork is often a very important part of air pollution control. Hoods and the air exhausted must be adequate to prevent escape of contaminants to the atmosphere. On the other hand, the air exhausted through a hood must usually be treated to remove the contaminant. Therefore, to keep capital and operating costs of control equipment to a minimum, no more air should be exhausted than is necessary for complete capture. By designing the hood with the minimum openings necessary, the air quantity to be exhausted can often be decreased.
