The Macrodata Refinement department has one supply closet. Its ceilings are higher than those in the main workstation area.

The closet contains quite a lot of copier paper, though the Refiners do not appear to do a lot of printing or copying. It also contains extra desk lamps and other duplicate desk items.

The supply closet was frequently used to hide while reading illicit material such as The You You Are and planning the Overtime Contingency Protocol.

After the Macrodat Uprising, the supply closet was changed into a shallow bookshelf-style closet with no way to step inside. This is ostensibly because such a space would no longer be necessary to obtain privacy from Lumon Administration, but it only serves to reduce possible privacy for the innies and reduce choice of desk adornment.