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Do you have an automatic setting on the control? Not sure but they may open automatically if in the auto mode. When in auto, my 2010, 3400RL, fantastic fan will turn on and off by itself but the hatch usually stays open in auto mode. Yours is much newer so it may open and close by itself. I suggest playing around with the settings and see what happens. I do have a vent cover on mine so no problem if strong winds come in when I am not there. If it rains, as others have said, they should close themselves.
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