TL;DR
A sprinkler head temperature rating is the activation point at which the head's bulb or link releases, classified by NFPA 13 into bands such as ordinary (135-170 F), intermediate (175-225 F), and high, each marked by bulb liquid color or frame finish. Ratings are matched to expected ceiling temperatures: ordinary heads serve most rooms, while attics, near skylights, and above ranges call for intermediate or high so routine heat does not trip them.
What it means
A sprinkler head temperature rating is the activation point at which the head's bulb or link releases, classified by NFPA 13 into bands such as ordinary (135-170 F), intermediate (175-225 F), and high, each marked by bulb liquid color or frame finish. Ratings are matched to expected ceiling temperatures: ordinary heads serve most rooms, while attics, near skylights, and above ranges call for intermediate or high so routine heat does not trip them. A red bulb (155 F) is the common residential sight, and mismatched ratings are a correctable inspection finding.
Where it sits in the glossary
Sprinkler head temperature rating is part of the Trade jargon 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.