A:Answer Always have the door with the flap attached be the last one to open, and the first one to close. The reason is because the flap will pull or push the gasket on the other door, causing additional (and unnecessary) wear which will eventually tear the gasket prematurely on the other door (the one without the flap). I mention this to people who are unaware of this (as evidenced by them doing it the other way around); and upon checking, I see that many have the (non flapped) door seals that are already torn (and leaking).
I’m surprised I don’t see this advice plastered all over the internet (yet).
I think it is a significant occurrence enough to warrant Industry wide education on the part of the sales reps in appliance stores. And then once they are educated about it, they should share that information (kind of like an inside tip) to the consumer immediately after demonstrating how convenient it is to be able to open either door without opening the other.