There are two kinds of fires in laboratories: planned and unplanned.
In the 19th century, chemical laboratories and college chemistry buildings were frequently destroyed by fire. Because of the dangers of fire, laboratories and buildings began to be constructed of noncombustible materials both inside and out: metal, brick and stone. By 2017 however, wood and plastic may be found in the laboratory due to the installation of water fire suppression systems installed throughout the laboratory. These protective systems are supplemented by building evacuation alarms activated by heat and smoke and designed to protect human health via early warning of dangerous conditions.