Welcome to the forum and hope you enjoy your new Bullet. If you are looking for some additional "assistance" when going through your unit to make sure all is right, you might want to download a Pre Delivery Inspection Checklist which is available to members on this forum. You can access it by going to Flyguy's
website and following the links there. Hopefully, you will not hand over the balance of what is owing until the dealer has corrected any deficiencies you might find on your one-night campout.
Not sure if you are referring to the Fantastic Vent or the Fantastic Fan. Both accessories will fit the standard pre-exisiting vent hole in your bathroom. Perhaps you can work out a "deal with your dealer" to have it installed for nothing or at a greatly reduced cost. If you are a bit handy, there are installation instructions that come with both the vent and the fan. Doing it yourself shouldn't prove that difficult.
We have two Fantastic Fans in our Cougar and they have so far lived up their claims and expectations. One is located in the bedroom; the other in the living room/kitchen area. We negotiated a price for both units - including installation - with our dealer when we bought the RV.
Note: Here is Flyguy's PDI....