Answer:
The opening must be placed in the lower parts of the wall.
Explanation:
The hot air is less dense than the cold air and therefore, in an environment that needs to be heated, the openings for the hot air outlet must be placed in the lower areas of the ground, allowing the incoming hot air to be able to go up, due to its low density, and warm the entire room in a balanced way. If the opening is placed too high, the hot air will rise further and will not heat the room.
