Subject	ventilator
Predicate	be kept
Object	at the top of a room
Modality	Modality Occurrences
Polarity	POSITIVE
Plausibility	0.8781
Neighborhood Sigma	0.9738
Local Sigma	1.0000
Example Sentences	Sentence Occurrences Source ventilators are kept at the top of a room 1 Answers.com Questions