Somehow my last sentence did not get in my answer to Dwight.
As we have owned the Entegra Cornerstone for 2 years now we just had one of our friends that owns a 5th wheel and never a coach show us how to use the bath vents that have a button that if pushed will operate the fan automatically to open the fan to exhaust hot temperatures if it reaches above 78 degrees. One being in the rear bath that is over the engine compartment does a fantastic job of cooling that compartment when stopping for the night after traveling all day or when using the washer/dryer that is in same compartment emitting moisture and heat.
How we never noticed and did not ever look at this button, it was very plainly noted and marked what it does, or remember reading about this feature is beyond me. In another case on same unit we were telling about how the exhaust fan on the microwave did not work very well as on our old Beaver. Other Entegra friend and owner then showed me that the flapper on the exhaust fan was locked shut by 2 clips up under the exterior hood on the outside of the unit.
Never too late or too foolish to ask a question because what you know about in other situations does not always work in a Coach feature.