@Bakersdozen - I don't think you need to worry about that. Fire compartments are usually part of a scheme called passive fire protection. They're designed to work in tandem with other fire safety equipment, such as sprinklers.
Generally they may automatically close when smoke or heat is detected, but not seal the exit. So there's be no problems with evacuations.
I work in a senior care home and we have this system in place. Thankfully it's never been needed, but I appreciate the extra time it would grant me should we need to clear the building.