Patent ID: 8441359

Claim:
A fire distinguishing device comprising: a detection device which detects an outbreak of a fire; a fire presence/absence distinguishing device which distinguishes the presence or absence of the fire; and a cumulative time determining device which determines a cumulative time required for distinguishing the presence or absence of the fire, in the fire presence/absence distinguishing device, wherein the cumulative time determining device distinguishes a phenomenon type of a phenomenon detected by the detection device, based on variation in a fire quantity detected by the detection device over a predetermined first time period, and an environment type of an environment where the detection device is installed, based on variation in a fire quantity over a predetermined second time period which is longer than the first time period, determines the cumulative time according to the distinguished environment type or phenomenon type, and if the distinguished phenomenon type is a predetermined phenomenon type, regardless of the environment type, determines the cumulative time according to the distinguished phenomenon type.