I think it depends on the style of range hood you have. I have heard that some don't vent to the outside but vent through a charcoal filter back to the inside, doesn't make sense to me but it is what it is. As far as venting to the outside there are at least two styles of vent flaps. One, like I have has 2 retainers that you turn to release the flap to do it's job. Some are a little more difficult to operate and have 2 button style retainers that you push up and at the same time rotate out to release. It should not be left open all the time. Make sure you secure it when you travel or you may not have it long, it will flap in the wind and disappear.
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2014 Palomino Puma 25RS
2011 F-150 Super Crew XLT
Days camped in 2014 - 23 Camped 2015-47
Camped 2016-71, 2017-33, 2018-29 booked
KT4W
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