Yes, I assumed that was what it was for.
When they recreated the Bee Bee Z, in as much faithful detail as possible. They noted the pilot tended to get rather woozy. Right in front of his face, in the middle of the instrument panel, was a thing that looked like a radio speaker but was fresh air from outside. And in their faithful replica they had put the air intake tube right behind the engine exhaust. They moved it and the pilot quit feeling woozy. They asked some of the original pilots and crewmen if the pilots got woozy and they said, "Yes, as a matter of fact; they did."