"Andrew" wrote in message ...

Just noticed these in the Richer Sounds Clearance sale.

I find it difficult to believe that this would provide
66 minutes of protection. The speaker itself will
contain wiring and other plastic components that will
be exposed the highest temperatures in a burning room
below so will contribute to the fire.


https://www.richersounds.com/clearan...4.html?instore

Its the other way around.

It is intended to contain and stop a fire spreading in the void of a
suspended ceiling should the fire start in the speaker.

For PA systems they are usually called fire domes.