Fan window

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Same as Fan light (above).

See also: Fan

References in periodicals archive ?
When she calmed down she told me that she spotted a camera's lighting in the fan window and she thought somebody had filmed her.
Detainees at a police station in Quezon City will now feel the heat, literally, after a failed jailbreak attempt using an exhaust fan window as an escape route prompted the city's top police official to seal off these possible exit points.
Though the fan window is small, a person can squeeze in and let himself out, Albano noted.