NFIRS 5.0 Element: ‘Fire Spread’

Définition : The extent of fire spread in terms of how far the flame damage extended. The extent of flame damage is the area actually burned or charred and does not include the area receiving only heat, smoke, or water damage.
Purpose : In combination with other information, this element describes the magnitude or seriousness of the fire. It can be used to evaluate the effectiveness of built-in fire protection features or the effectiveness of the fire suppression force relative to the conditions faced. The confinement and extinguishment of a fire is influenced by many factors. Fire spread indicates the combined effect of these conditions. Also, the analysis of fire spread over many fires can reveal the effects of individual factors.
Entry : Check or mark the box best describing the extent of fire spread.
If the fire was confined to the object of origin, an entry should have been made in Block D3 of the Fire Module. Do not check or mark any additional box in this block.
A room is a partitioned part of the inside of a building. If the flame damage extends beyond the area of origin in a one-room building, such as a shed, the damage should be described as Confined to the Building of Origin. The Confined to the Building of Origin box is also the appropriate description if the fire was on the roof or outside wall of a building.

Element Specification

 Specification   Value 
Requirement Mandatory
Expected Length 1
Element Type Coded Field – The coded field relating to an entry in the code table. Most coded fields allow for Plus+ One codes. For these fields the expected length of the coded entry is depicted as (National length OR Plus+ One length). Only fields with this notation in the expected length column allow for Plus+ One definitions. If the user has not provided information, an empty field should be transmitted.


Here are the NFIRS codes for the ‘Fire Spread’ element

Fire Spread  Code 
Confined To Object Of Origin 1
Confined To Room Of Origin 2
Confined To Floor Of Origin 3
Confined To Building Of Origin 4
Beyond Building Of Origin 5

Relational Edit Rules for ‘Fire Spread’

NFIRS defines relational edit rules to ensure data consistency and accuracy in its database. These are the rules for ‘Fire Spread’.

Rule Group  Overview 
Relational Edit Rule 67 relational edit rule 67.
Relational Edit Rule 69 Spread to Same Floor or Less.

Topic: NFIRS