I know I made it hard to aprehend, but if you don't want to relocate your battery, just cut a hole in the backside of the box for the air hose to go into, then push the batter as far forward as you can so you can make room for the hose behind it. It is a tight squeeze, but that's how I had it before the battery relocation.

The purpose is to add more cold air instead of more hot air.