ducted fan

[EN 12792:2003, 157]:
fan for moving air within a duct (see also fan installation types)partition fan

[EN 12792:2003, 157]:
fan used for moving air from one free space to another (see also fan installation types)jet fan

[EN 12792:2003, 157]:
fan for producing a jet of air in a space (see also fan installation )circulating fan

[EN 12792:2003, 157]:
fan used for moving air within a space (see also ISO 13349 and fan installation types)