We cut out for a vent behind where the refrigerator/water heater will go. Also cut out right next to this behind the shower, for an outdoor shower access door. We love to ride our 4wheelers in the mud so we knew from experience with our other travel trailer that we would need an outdoor shower. We bought an outdoor shower tent from Cabela's a couple of months ago and set it up around back. It worked out great to have the privacy outside for a hot shower without tracking all that mud inside.