TL;DR
A sprinkler head is the heat-activated discharge device of a fire sprinkler system, holding back pressurized water with a glass bulb or fusible link that releases at a set temperature and sprays water in an engineered pattern over the fire below. Each head operates individually, so a kitchen fire opens one or two heads, not the whole building, contrary to film convention.
What it means
A sprinkler head is the heat-activated discharge device of a fire sprinkler system, holding back pressurized water with a glass bulb or fusible link that releases at a set temperature and sprays water in an engineered pattern over the fire below. Each head operates individually, so a kitchen fire opens one or two heads, not the whole building, contrary to film convention. Residential systems under NFPA 13D use listed residential heads, and painting or hanging anything from one compromises its response.
Where it sits in the glossary
Sprinkler head is part of the Certifications group inside the ProFix Directory glossary. Browse every term in this category from the glossary index.
Why Ohio homeowners should know it
This is a term Ohio homeowners encounter when reading contractor quotes, hiring paperwork, or inspection reports. Understanding it well enough to ask one good follow-up question is usually all the protection a homeowner needs.
ProFix Directory keeps definitions short on the index page and saves the longer context — Ohio-specific rules, where the term comes from, and which ProFix tools touch it — for these per-term pages so the term is easy to cite and easy to share.
ProFix tools that touch this term
See also
License: CC-BY-4.0 — quote freely with attribution to ProFix Editorial Team / ProFix Directory.