Organized sample storage
Drawer or side access?
Stainless steel or aluminum?
By standard, there are two types of rack materials available.
Depth of racks
There are two systems used in laboratories - the standard 4-boxes deep racks and 5-boxes deep racks. Why is this of any interest? In case of an emergency, you want to rescue your valuable samples. The easiest way is to take out all racks (with the samples/ boxes included) and store those racks in some backup freezer. To be compatible with most common ULT freezer suppliers, Eppendorf ULT freezers are designed for 4-boxes deep racks.
3-compartment or 5-compartment?
The ULT freezer with 3 compartments/ shelves (e.g. Innova U535) has higher compartments compared to the 5-compartment ULT freezer (e.g. CryoCube F570 series). Racks of a 5-compartment freezer do fit into a 3-compartment freezer but not vice versa.
To get the maximum capacity out of your ULT freezer, the CryoCube F740 series (3-compartment) can be equipped with "3-compartment MAX" racks. These racks only fit into the CryoCube F730 3-compartment instruments.