Question

Why
are ventilators in houses provided at the top of walls?​

Answer 1

Here,

Ventilators are provided in the rooms at the top of the roofs, just below the roofs because if the air inside the room gets hot thehot air rises up and flow through these ventilators and thus cool air remains at bottom so that to relive in hot sumers

Answer 2

Answer:

because air in the room absorbs heat and become lighter thus moves upwards and in comparison to hot air cool air is heavier and remains low to ground if ventilator is placed at lower height then it may take away cool air of the room