1.   Boeing said that one possiblity was to ventilate the space around the tank.

2.   A. There are two ways to ventilate that space behind the knee walls.

3.   Is there a way to ventilate that space?

4.   The roof has a large overhang, so it is possible to ventilate that space.

5.   Ventilating that space is difficult and iffy because it is so shallow.