That's right, mine's the same way. Take a look at the next picture and notice the vent on the left is facing forward, this one only has a vent leading all the way to the bilge so fresh air is forced all the way down. The right vent faces aft and the blower is attached to this vent making sure the blow direction is toward the vent. The blower also has a hose that goes all the way down to the bilge so it can scavenge all the gas fumes that like to accumulate there.
This is the Coast Guard suggested setup. Too bad I don't have any pictures of the blower inside the engine compartment.