Paul Sawyer, United Air Specialists, Inc.

When source capture isn’t an option

Source capture and ambient systems for collecting contaminants include hoods, ducting, air-cleaning devices and air-moving devices like fans, along with separate hoods and ducting. Capturing contaminants at the point of generation before they can escape into the ambient air is always the recommended approach, but many factors in plant layouts can make a source capture system impractical.