Here's pic of the installed vent. When pulled out, the vent will reach to the back seats and all the way to the opposite rear corner of the boat. So you can pretty much sit anywhere on the seats and one of the pull out vents will reach you.

Here you can see that I can still store my towels in the area just to the right of the vent so I lost virtually no storage space.

Tip: Attach the flex hose to the hot tube before mounting the hot tube. It's a lot easier that way.