Vent in bottom?

[first time 5er]

Just finishing removing some unwanted tenants from my 09 Cougar 320SRX. While looking for entry ways underneath, i noticed a 2" round hole next to where the propane pipes go up into the plastic bottom covering.
It has a 2" foil vent hose connected to it.
Anyone know what it is for?
Should i cover it with a wire box mesh?

[chuckster57]

Where are the batteries? If they are in a closed compartment then the box will be vented top and bottom.

[first time 5er]

No batteries are up front. This vent is just forward of the front axle on right side.
under furnace or fridge

[first time 5er]

After further inspection i have come to the conclusion that it is not a vent. The hole is for the propane lines but i think it was cut in the wrong place. Go figure? the vent tube that i see is part of the "polar Package" to keep the tanks from freezing. They just happened to be in the same place. I'll just cover the hole with some 1/4 " box mesh and foam it up.