Firefighters are often asked to speak to school and community groups about the importance of fire safety, particularly fire prevention and detection. Because smoke detectors reduce the risk of dying in a fire by half, firefighters often provide audiences with information on how to install these protective devices in their homes. Specially, they tell them these things: A smoke detector should be placed on each floor of a home. While sleeping people are in particular danger of an emergent fire, and there must be a detector outside each sleeping area. A good site for a detector would be a hallway that runs between living spaces and bedrooms. Because of the dead-air space that might be missed by turbulent hot air bouncing around above a fire, smoke detectors should be installed either on the ceiling at least four inches from the nearest wall, or high on a wall at least four, but no further than twelve inches from the ceiling. Detectors should not be mounted near windows, exterior doors, or other places where drafts might direct the smoke away from the unit. Nor should they be placed in kitchens and garages, where cooking and gas fumes are likely to cause false alarms.
A smoke detector should not be installed near a window because
A draft may pull smoke away from the detector.
The correct answer is a draft may pull smoke away from the detector.
The passage explains that smoke detectors should not be installed near windows because air currents (drafts) coming through the window can carry smoke away from the detector before it accumulates enough to trigger the alarm, delaying or preventing detection.
The claim about false alarms from outside fumes is not the reason given in the passage.
The claim about drafts creating 'dead-air space' reverses the actual mechanism — the passage discusses drafts diverting smoke, not creating dead-air space (dead-air space is instead the reason detectors are kept away from corners, a separate point in the passage).
The claim about noise muffling the alarm is not mentioned as a reason for avoiding window placement.
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