'Well ventilated' in the Bible

When Ehud approached him, he was sitting in his well-ventilated upper room all by himself. Ehud said, "I have a message from God for you." When Eglon rose up from his seat,

When Ehud had left, Eglon's servants came and saw the locked doors of the upper room. They said, "He must be relieving himself in the well-ventilated inner room."