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Fire Systems

Jul 31, 2021

Fire Sprinkler Heads & Inspection FAQ

Why Naso Supply?

When it comes to fire sprinkler systems, the right parts aren’t just important—they’re critical. At NASCO, we know this firsthand because we’ve spent years in the field installing and maintaining fire protection systems ourselves. That’s why we stock only UL/FM certified sprinkler valves, fittings, and accessories that meet the highest safety standards.
1/2" SIDEWALL SPRINKLER, Quick Reaction, Chrome, (Date Code: 2023), UL/FM Listed

1/2" SIDEWALL SPRINKLER, Quick Reaction, Chrome, (Date Code: 2023), UL/FM Listed

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1/2" CONCEALED SPRINKLER PENDENT, (Date Code: 2023), Quick Reaction, UL Listed
1/2’’ CONCEALED SPRINKLER PENDENT Quick Reaction - Fire Sprinkler Systems

1/2" CONCEALED SPRINKLER PENDENT, (Date Code: 2023), Quick Reaction, UL Listed

Regular price $13.73
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1/2" PENDENT SPRINKLER, Quick Reaction, Brass (Date Code: 2023), UL/FM Listed

1/2" PENDENT SPRINKLER, Quick Reaction, Brass (Date Code: 2023), UL/FM Listed

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Fire Sprinkler Heads & Inspection FAQ

Get answers to common questions about fire sprinkler heads, NFPA codes, and inspection tips. Perfect for contractors, plumbers, and fire protection professionals.

What are the main types of fire sprinkler heads?

The four primary types are:

  • Pendant – hangs from the ceiling, spraying downward in a circular pattern.
  • Upright – mounted above piping, spraying water downward with a curved deflector.
  • Sidewall – installed on walls, projecting water horizontally for hallways or small rooms.
  • Concealed – recessed behind a cover plate for a clean look until activation.

Related Products: Sprinkler Heads

Are there different sprinkler head performance options?

Yes. Sprinklers are classified by response type (standard or quick), coverage area (standard vs. extended coverage), and specialty use (e.g., ESFR, corrosion-resistant, or residential sprinklers).

What are the different types of fire sprinkler systems?
  • Wet Pipe – most common, pipes always filled with water.
  • Dry Pipe – pressurized air/nitrogen holds water back until activation (used in unheated spaces).
  • Pre-Action – requires both detection system activation and sprinkler head operation.
  • Deluge – all heads open at once, used in high-hazard areas.

Related Products: Dry Pipe Valves | Pre-Action Valves

What is the NFPA code for fire sprinklers?

NFPA 13 is the standard for design and installation of automatic fire sprinkler systems. It governs placement, spacing, hazard classification, and water supply requirements.

What is the 18-inch rule for fire sprinklers?

Storage must be kept at least 18 inches below sprinkler deflectors to avoid blocking water spray. This ensures proper coverage during activation.

How often should fire sprinkler heads be replaced?
  • ESFR, CMSA, and dry sprinklers: test/replace at 20 years.
  • Fast-response: test/replace at 25 years (then every 10 years).
  • Standard-response: test/replace at 50 years.

Sprinklers must also be replaced if damaged, corroded, painted, or previously activated.

Do sprinkler pipes have to be painted red?

Not always. Local codes may require exposed sprinkler piping to be painted red, but hidden piping often has no color requirement. Sprinkler heads themselves should never be painted.

How many sprinkler heads can run on one line?

This depends on pipe size, pressure, and flow rate. For example, a 2-inch pipe may support up to 8 sprinkler heads at once, while a 2½-inch pipe may support 15 heads. Always verify with NFPA 13 and local code.

Need help selecting the right fire protection components? Browse our Fire Valves and Sprinkler Heads collections.