1910.160(b): Fixed Fire Extinguishing System Requirements
Employers must use fixed extinguishing system parts and agents approved for the specific hazards, warn workers and take precautions when a system is out of service, and provide discharge alarms and warning signs where agents are hazardous. Systems must be inspected annually by a knowledgeable person, and refillable containers checked for weight and pressure at least semi-annually.
Key takeaways
- 1910.160(b) is part of OSHA's general industry standards (29 CFR Part 1910, Subpart L).
- OSHA cited it 34 times in the last 3 years, in 33 inspections, with $167,927 in current penalties.
- Most citations: PR (14), HI (5), CT (4).
- Related part: 1910.160(b)(6) (31 citations).
- Free 5-minute toolbox talk for your crew below.
In this article
What this rule covers
29 CFR 1910.160(b) ("General requirements") is one requirement inside 1910.160 Fixed extinguishing systems, general, an OSHA general industry standard (Part 1910, Subpart L). It includes 17 sub-paragraphs. The official text below is copied word for word from the Electronic Code of Federal Regulations (eCFR). The numbers, injury cases and training on this page show how OSHA enforces it on real job sites.
Official text
(b) General requirements. 34 citations
(1) Fixed extinguishing system components and agents shall be designed and approved for use on the specific fire hazards they are expected to control or extinguish.
(2) If for any reason a fixed extinguishing system becomes inoperable, the employer shall notify employees and take the necessary temporary precautions to assure their safety until the system is restored to operating order. Any defects or impairments shall be properly corrected by trained personnel. 1 citations
(3) The employer shall provide a distinctive alarm or signaling system which complies with § 1910.165 and is capable of being perceived above ambient noise or light levels, on all extinguishing systems in those portions of the workplace covered by the extinguishing system to indicate when the extinguishing system is discharging. Discharge alarms are not required on systems where discharge is immediately recognizable. Open (b)(3)
(4) The employer shall provide effective safeguards to warn employees against entry into discharge areas where the atmosphere remains hazardous to employee safety or health.
(5) The employer shall post hazard warning or caution signs at the entrance to, and inside of, areas protected by fixed extinguishing systems which use agents in concentrations known to be hazardous to employee safety and health.
(6) The employer shall assure that fixed systems are inspected annually by a person knowledgeable in the design and function of the system to assure that the system is maintained in good operating condition. Open (b)(6) 31 citations
(7) The employer shall assure that the weight and pressure of refillable containers is checked at least semi-annually. If the container shows a loss in net content or weight of more than 5 percent, or a loss in pressure of more than 10 percent, it shall be subjected to maintenance.
(8) The employer shall assure that factory charged nonrefillable containers which have no means of pressure indication are weighed at least semi-annually. If a container shows a loss in net weight or more than 5 percent it shall be replaced.
(9) The employer shall assure that inspection and maintenance dates are recorded on the container, on a tag attached to the container, or in a central location. A record of the last semi-annual check shall be maintained until the container is checked again or for the life of the container, whichever is less. 1 citations
(10) The employer shall train employees designated to inspect, maintain, operate, or repair fixed extinguishing systems and annually review their training to keep them up-to-date in the functions they are to perform.
(11) The employer shall not use chlorobromomethane or carbon tetrachloride as an extinguishing agent where employees may be exposed.
(12) The employer shall assure that systems installed in the presence of corrosive atmospheres are constructed of non-corrosive material or otherwise protected against corrosion.
(13) Automatic detection equipment shall be approved, installed and maintained in accordance with § 1910.164. Open (b)(13)
(14) The employer shall assure that all systems designed for and installed in areas with climatic extremes shall operate effectively at the expected extreme temperatures.
(15) The employer shall assure that at least one manual station is provided for discharge activation of each fixed extinguishing system.
(16) The employer shall assure that manual operating devices are identified as to the hazard against which they will provide protection. 1 citations
(17) The employer shall provide and assure the use of the personal protective equipment needed for immediate rescue of employees trapped in hazardous atmospheres created by an agent discharge.
Source: eCFR, text current as of 2026-10-15. Read all of 1910.160.
Where and how often it was cited
| Year | Citations |
|---|---|
| 2023 | 1 |
| 2024 | 10 |
| 2025 | 11 |
| 2026 | 12 |
Top states: PR (14), HI (5), CT (4), MD (2), VI (2)
Largest penalties
| Employer | Location | Penalty for this rule |
|---|---|---|
| DE | CATANO, PR | $47,285 |
| DE ESCUELA LINO PADR?N RIVERA | VEGA BAJA, PR | $25,000 |
| DE | NARANJITO, PR | $20,000 |
| DE | TOA BAJA, PR | $20,000 |
| DE-ESCUELA EUGENIO MAR�A DE HOSTOS | ARECIBO, PR | $14,187 |
Free toolbox talk
A 5-minute crew talk on 1910.160(b), plus alerts when this rule changes. Free.
OSHA interpretation letters
- Fire detection and employee alarm systems. (1981-08-07)
Related parts of this rule
- 1910.160(b)(6) 31 citations
- 1910.160(b)(3)
- 1910.160(b)(13)
Get your crew competent
Trainers on Black Belt Safety: Marc Harvey, Dana Reyes
Trainers and suppliers: feature your business on this rule for $25/month.
Frequently asked questions
How often must fixed extinguishing systems be inspected?
Annually, by a person knowledgeable in the design and function of the system.
When does a refillable container need maintenance?
When it shows a loss in net content or weight of more than 5 percent, or a loss in pressure of more than 10 percent.
What must happen if the system goes out of service?
The employer must notify employees and take temporary precautions until it is restored, and defects must be corrected by trained personnel.
About this page
Sources
- 29 CFR 1910.160 (eCFR), text current as of 2026-10-15
- U.S. Department of Labor enforcement data: OSHA inspections, citations and accident records, copied nightly; data as of 2026-10-22
3-year window. Federal OSHA only; state-plan rules are not counted. Plain-language text is a summary, not legal advice; the official text controls. Black Belt Safety is not part of OSHA or the Department of Labor.