Fail Safe Thermostat – This thermostat goes in the warmest part of the house,
so that in the event the temperature gets warmer than is safe, it breaks the
computer integrity signal, and forces the ventilation back to manual thermostats. If
someone were to enter an incorrect temperature target into the system and ignore
all the alarms and warnings, this thermostat would interrupt the computer signal
and cause the fans to run based on the thermostat settings (Third level backup
protection).