Figure 3.  Hood types:  (a)  Enclosure; (b) Receiving; (c) Capturing; (d) Downdraft; and (e) High velocity, low volume.

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  1. Enclosure - contains contaminants released inside the hood.
  1. Receiving hood - catches contaminants that rise or are thrown into it.
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  1. Capturing hood - reaches out to draw in contaminants
 
  1. Downdraft hood
 
  1. High velocity, low volume hood