Reference table

Occupancy Hazard Classification Reference

Name: Occupancy Hazard Classification Reference
Keywords: NFPA 13 occupancy hazard classification

Screen common occupancy examples against broad NFPA 13 hazard classes for early sprinkler design scoping and calculator setup.

NFPA 13 occupancy hazard classification6 rows2 linked calculators

Rows

Reference values

Columns

Lookup fields

Linked tools

Calculators using this data

Source governance

Record how this table is used before carrying a value into a calculator, worksheet, or authority workflow.

Governance item	Record	Use boundary
Source class	Design-basis selection aid	Use the table as a controlled reference input, not as an adoption or approval database.
Last review basis	Static registry review	Re-check adopted standards, manufacturer data, and project criteria before final use.
Known limit	Occupancy, storage, commodity, and local amendment context can control the final basis.	Escalate unresolved code, listing, or jurisdiction questions to the project record.
Downstream record	Occupancy Hazard Classifier Calculator, Design Density Lookup Calculator, Hazard Classification and Density Setup Worksheet, NFPA 13 Hydraulic Design Worksheet	Keep selected rows with the worksheet, calculation package, or authority record.

Reference table use

Use the table as controlled input data: select the row, verify the condition, and carry the value to the related calculator.

Usage context

1Use this table when selecting nfpa 13 occupancy hazard classification for preliminary fire protection calculator setup.
2Treat the lookup value as an engineering input that must be traceable to project conditions, manufacturer data, or adopted standard criteria.
3Apply the selected value before using 2 linked calculator workflows that depend on this reference.

Selection rules

1Match the row against the actual project condition before selecting a Occupancy / Likely Hazard Class / Screening Note value.
2Do not interpolate, round, or substitute a value unless the project calculation basis explicitly allows it.
3When multiple rows appear plausible, choose the conservative value and document the reason for the selection.

Review checks

1Selected row matches drawings, device listings, field readings, or occupancy assumptions.
2The selected value is carried into the downstream calculator with the correct units and label.
3The result is reviewed against 2 linked calculator uses before final design reliance.

Reference field	How to use it	Related tools
Occupancy	Use this field to identify the matching project condition.	Occupancy Hazard Classifier Calculator, Design Density Lookup Calculator, Hazard Classification and Density Setup Worksheet
Likely Hazard Class	Carry this value into the downstream calculator with the displayed units and label.	Occupancy Hazard Classifier Calculator, Design Density Lookup Calculator, Hazard Classification and Density Setup Worksheet
Screening Note	Carry this value into the downstream calculator with the displayed units and label.	Occupancy Hazard Classifier Calculator, Design Density Lookup Calculator, Hazard Classification and Density Setup Worksheet

Representative Occupancy Screening

Occupancy	Likely Hazard Class	Screening Note
Offices	Light Hazard	Low fuel loading and low combustibility
Restaurants dining areas	Light Hazard	Public areas with limited fuel load
Parking garages	Ordinary Hazard Group 1	Vehicle storage with moderate combustibility
Manufacturing, moderate load	Ordinary Hazard Group 2	Combustible process or storage density
Printing plants	Extra Hazard Group 1	High challenge process with combustible materials
Flammable liquid processing	Extra Hazard Group 2	Severe fuel challenge requiring specialist review

Engineering disclaimer

NFPA in USA provides engineering workpapers, calculation checks, and reference tables for project screening and coordination. Final design decisions, code interpretations, submittals, and acceptance records must be completed by qualified professionals and verified against the adopted code, project criteria, listings, and Authority Having Jurisdiction requirements. This site does not issue signed or sealed engineering documents.

Tools and workflows that use this table

Occupancy Hazard Classifier Calculator Design Density Lookup Calculator Hazard Classification and Density Setup Worksheet NFPA 13 Hydraulic Design Worksheet

FAQ

How should this hazard classification table be used?+

Use it as an engineering reference source for selecting values, checking assumptions, and documenting the basis carried into a calculator or worksheet.

Can this table replace the sealed project record?+

No. Values still need to be checked against the adopted standard, manufacturer data, project specifications, and Authority Having Jurisdiction requirements before they are used in final documents.