I open mine all the time on my ACE 30.2 and I used to on my Dutchman fifthwheel. The fifthwheel was better. the handle was longer and would hold the window open further. On my ACE the one up front the handle acts as a latch and will hold it open a little ways and has a screen. The one in the bedroom probably isn't meant to be opened except for emergencies since there is no screen and its just a latch and doesn't have a handle to hold it open but I do it anyway.
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