When you open two windows on opposite sides of a room there will be a draft going through the room. What dictates the direction of that draft?

Question

I often open my balcony door and my front door to let fresh air into my apartment. I’ve noticed that the draft almost always flows from the balcony and out the front door. Shouldn’t the direction be random?

In: Physics

Answer 1

Prevailing wind outside is pushing the air in one direction without the window on the opposite side there is nowhere for the pushed air to go so the air only moves when two openings are there.