Yes, they can be effective for assassins in particular. You can sneak in as the innocent little girl and then kill your prey in the first night. Nice thought.
Also, big, wall mounted fans like in the Alien (3?) movie... electrical ones (or steam-powered) that you can throw your opponents into to mince them.

Edit: and I, too, think that fans who are ppl. are weapons. They\'ll distract the prey so you can assassinate them easily... Or they suffocate their prey by sheer mass.
