Instruct: Classify the given review as either positive or negative.
Query: Beware- Not as described

Bought this fan to put in my sliding window, but found that it takes a permanent installation of a bracket and screws. Side wings will not stay open with any pressure on them, even when locked. This fan is going back. Did not bother to plug in, so I don't know about noise level or if it was defective in other ways.