The little bottom section of that passenger window was VIRTUALLY USELESS on my 15 Anthem.... it contributed nothing to coach ventilation and the only thing that I ever thought it was useful for (and the one reason I wish I still had it) was that if someone knocked on my door at 3:00 AM (policeman, fireman, ????), I could crack that window a little to facilitate talking to whoever was knocking without unlocking the door or trying to communicate through the closed door.... but for ventilation, it was worthless. And as a bunch of others have already mentioned, it was something that failed routinely and Entegra was replacing a fairly high percentage of the windows.... the window itself failed, and the locking and latching mechanism would also come away from the glass. I have a buddy with a 15 Cornerstone that had the opening window at the bottom and he is forever trying to re-glue the crank mechanism back to the window.
Not worth the effort to get one, in my opinion....
Gary and Dee, Zowie and Bowie (traveling cat sibs)
2019 Cornerstone 45B, X15-605hp, Imperial, Spartan K3,
2013 Honda CR-V toad, Demco Excali-Bar II,
Demco Baseplate, Demco Toad Light system, 73 de W5Fi