Question

why is it good to have ventilators at the top of the walls​

Answer 1

Explanation:

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It helps your home rid itself of moisture, smoke, cooking odours, and indoor pollutants. Structural ventilation controls heat levels in the attic, moderates dampness in the crawlspace and basement, and keeps moisture out of uninsulated walls...

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Answer 2

Answer:

Houses and theatres have tall windows or opening called ventilators near their ceilings. Hot air rises and escapes through the ventilators near the roof. It is replaced by the cool air that comes through doors and windows. In some rooms and halls, exhaust fans near the ceiling remove the warmer air from the room to the outside