MB4 223a: Dimensions of a Mavoi (363:26 - part 2)
Lowering the korah or raising the ground under the korah.
What counts as a mavoi?
It has to have two chatzerot opened to it and each chatzer has to have 2 houses. Each house has to have a 4-tefach doorway and people eating inside. Only then can a korah or lechi alone suffice to permit carrying.
The mavoi's length has to be greater than its width (width = the side with the opening).
If an area doesn't fit the definition of a mavoi, it is halachically considered a chatzer instead.
Do we have mavuot today?