The adoption of fire sprinkler systems has been the most important advancement in fire protection during the past 100 years. Fire sprinklers are the greatest approach to protect persons and property. Sprinkler systems are now frequently necessary because of how well recognized they are as being very effective.

The categories of fire risk for each building should be as follows: mild hazard, ordinary hazard group, and high hazard group. The hazard level of a building is determined by many different factors, including the material used in construction, occupancy level, materials stored in the building, processes performed in the building (and whether these processes involve flammable liquids), ceiling heights, ease of egress, and the number of floors and rooms.