Final answer:
The minimum fire rating for interior walls separating a laboratory from other portions of the building is 1 hour.
Step-by-step explanation:
The minimum fire rating for all interior walls separating the laboratory from other portions of the building depends on the building code and regulations in place.
In general, interior walls separating a laboratory from other areas of the building are required to have a fire rating of at least 1 hour. This means that the wall should be able to withstand fire for at least 1 hour without collapsing or allowing fire to spread to the adjacent areas.
It's important to note that specific requirements may vary based on local building codes and the type of laboratory. It's always best to consult the relevant building codes or authorities to ensure compliance.