Physics
Ventilators are provided near the ceiling of the room because

These do not look nice in the lower part
These provide cross ventilation in the room
The exhaled warmer air rises up and goes out
These provide some sunlight in the room

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Physics
Negative feedback in amplifiers

Increases bandwidth and decreases noise
Decreases bandwidth and increases noise
Increases bandwidth and increases noise
Decreases bandwidth and decreases noise

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