Stove hoods can be stainless steel, plaster,
plaster with tile, tile, wood, and a microwave/vent.
Stove hoods can be against the wall or floating
in the middle of the room for islands and peninsulas. When they are
floating in the middle of the room they usually referred to as free standing or
floating hoods. Another type of vent is a down draft which is usually
used for island cook-tops.
All hoods should be vented to the outside either
through the roof or outside wall.