Question

How do you detect house fire??

Answer 1

Alarms and detectors. The first sign you might have if there is a fire elsewhere in the building is a fire alarm or detector going off. ...
Smoke. An obvious sign of fire is smoke – as the old adage goes: “there's no smoke without fire”. ...
Smell. ...
Loud noises. ...
Hot door and door handle.

Answer 2

There are two types of residential fire detection systems: heat and smoke detectors. The basic residential detection system, according to NFPA 74, relies primarily on the use of smoke detectors.