← ToolsWhat "sample" means in §5.3.1.1.1: the sprinklers in the sample are removed from service and either tested by a recognized lab (UL, FM, or equivalent) per NFPA 25 §5.3.1.1.1.6, OR replaced. Lab-tested sprinklers that pass can be re-installed. Most facilities choose replace over test because the lab cost approaches the replacement cost. Either way, document the action against each sample sprinkler in the inspection record. AHJ may require larger samples — confirm before scheduling.
Sprinkler Head Sample Calculator
Per NFPA 25 §5.3.1.1.1, a representative sample of sprinklers must be tested at specific service ages — the most common case being the 50-year sample for standard and quick-response heads. This tool computes the sample count + tells you when the next sample is due.
1. Sprinkler type
Test cadence: First sample at 50 years from manufacture; second at 75 years; every 10 years thereafter
Citation: NFPA 25 §5.3.1.1.1.1 / .2 · 95% of installed sprinklers fall in this category.
2. Installation date
3. Sprinkler count
NFPA 25 sampling is per representative type AND per installation area. Enter total count for a quick number, OR break it down by area for AHJ-ready output.
Areas (recommended for AHJ submittal)
SAMPLE REQUIREMENTS
Enter a sprinkler count above to see sample requirements.