Height minimums for the top drawer and bottom drawer of a Double Drawer.
The minimum height for the bottom drawer in a double drawer is 4". With a 4" bottom drawer, the top drawer can be a max height of 2".
In order to have a 4" height top drawer, the bottom drawer should a be a minimum 6" in height.
We recommend the height for the bottom drawer to be 8" to provide adequate drawer space below the top drawer.