I’ve recently noticed (another item that was never mentioned at the purchase / walk-through time) that there is what appears to be an narrow black plastic opening that can snap open and close (Hononym I suppose) under what looks like a kitchen stove vent (Pass side) of some sort and I’m not clear on the purpose of this and when, why, and how it is designed to be used. If anyone can shed some light on this I’d appreciate it.