Reference2026-05-208 min
Fire Protection Drawing Symbols Quick Reference Guide
A practical guide to reading fire protection drawing symbols in CAD files sprinklers, detectors, pull stations, and more.
In this guide
Fire protection drawings use standardized symbols defined by NFPA and local AHJ requirements. When you open a DWG file in CadPeek, these symbols appear as blocks and inserts on specific layers.
Sprinkler symbols
Sprinkler heads are typically on layers named SP, SPRINKLER, FP-WET, or localized equivalents in the drawing's language.
- Pendent head circle with downward line
- Upright head circle with upward line
- Sidewall head half-circle on wall
- Concealed head dashed circle
Fire alarm symbols
Device tags like SD-1, SD-2 appear as TEXT entities searchable in CadPeek's text panel.
- Smoke detector SD with circle
- Heat detector HD
- Pull station MCP or PS
- Horn/strobe HS or H/S
- FACP fire alarm control panel rectangle
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