A quarantine chamber was a box-like apparatus with clear walls. It could be used for quarantining animals.
In 2152, a quarantine chamber was used, in sickbay aboard the NX-class starship Enterprise NX-01, to hold Jonathan Archer's pet beagle Porthos while the dog required medical attention. (ENT: "A Night in Sickbay")
The name "quarantine chamber" comes from the final draft script of "A Night in Sickbay".