I'm not sure why everyone has so much trouble with these vents . . . they are so easy to open!
Put your thumbs on the outside edge of each tab and push up and slightly out . . . and they pop open easily!
Here is ours:
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My tabs didn't budge until I put a lot of force on them. Thought for sure they might break but didn't
My tabs didn't budge until I put a lot of force on them. Thought for sure they might break but didn't