ETS-Lindgren SMART 1000 Mini-Reverb Cell - Manual (Page 35)

Penetrations | 35
7.0 Penetrations
Penetrations must be provided for any services which pass through the walls,
floor, or ceiling of the enclosure. These penetrations are normally put in place at
the time the enclosure is installed and rarely require maintenance.
Exceptions are for active penetrations such as cable feed-throughs,
tuner penetrations, and coaxial fittings, which must be re-tightened occasionally.
Installation of a new penetration can be performed by the customer but must be
done in accordance with ETS-Lindgren shielding practices. For more information,
see Good Shielding Practices on page 7.