Keysight Technologies RP7931A Guide D'utilisation Et D'entretien page 315

Appendix A Keysight SD1000A Safety Disconnect System
Dimensions
The SDS is passive-cooled and does not require a fan or other cooling
considerations - provided that the venting holes on the sides of the unit are not
blocked.
Keysight RP7900 Series Operating and Service Guide 315