Tsunami bilge/vent blower question

[bigeasy1]

On my 74 Tsunami,I'm wondering why Seacraft put vent hoses on both the port and starboard side rear louvered bilge vents.
Why would they put them on the air intake side?

Why not just run them from the the exhaust side to the blower and then down to the bilge.
That way the blower would pull any fuel vapors from the low point up and out to the vent.

Wouldn't any fresh air entering the intake side,be automatically drawn down to the bilge to replace the air being exhausted by the blower?

Also why two hoses on each side?,only one is connected to the blower.
I'd like to glass the vent boxes back in,but would like to omit the hoses on the intake side,as i'm going to be mounting a kicker bracket on that side,so the less clutter,the better.

Thanks for any input or recommendations.