1910.157(d)(1): Extinguishers must be selected and distributed based on the classes of anticipated fires and the size and degree of hazard. Using an ABC dry chemical on a Class D metal fire can cause a violent reaction. A Class K wet chemical extinguisher is required for commercial cooking — a regular ABC unit will not control a deep-fat fryer fire.

1910.157(d)(2): Maximum travel distances are 75 ft for Class A hazards, 50 ft for Class B hazards (flammable liquids), and 75 ft for Class C. Travel distance is measured along the actual walking path — not a straight line through walls. Class B has a shorter limit because flammable liquid fires spread faster. Measure actual travel paths, not map distances.

1910.157(c)(1): Extinguishers must be readily accessible. Blocking an extinguisher with a pallet, equipment, or stored material is one of the most common OSHA citations. Cabinets must not be locked unless there is a clear break-glass or quick-access mechanism. Employees must be able to retrieve an extinguisher without moving anything.

1910.157(c)(6): Mounting height is a specific OSHA requirement. Extinguishers mounted too high cannot be safely lifted and aimed during a fire. Extinguishers too low are a trip hazard and can be damaged by floor cleaning equipment. Both the top and bottom height limits must be met. Measure from the floor to the handle, not the base of the unit.

A discharged or low-pressure extinguisher provides no fire suppression. Check the pressure gauge on every monthly inspection — needle must be in the green zone. A broken tamper seal means the extinguisher may have been used or tampered with and must be inspected before returning to service. A missing pin means it can be inadvertently discharged.

Physical damage, corrosion at the base, dented cylinders, clogged or missing nozzles, and illegible labels all render an extinguisher unreliable or unusable in an emergency. A damaged extinguisher must be removed from service immediately and either repaired by a certified technician or replaced. Never return a damaged unit to service without professional inspection.

1910.157(e)(2): Monthly inspections are required. The inspection must verify the extinguisher is in its designated location, is unobstructed, has not been tampered with, and shows no obvious damage. The tag must show the month/year and initials. An OSHA inspector who finds a tag with a gap of more than one month will cite immediately.

1910.157(e)(3): Annual maintenance must be performed by a trained person with knowledge of mechanical parts, extinguishing agents, and discharge characteristics. This is not the same as the monthly visual inspection. Annual maintenance includes internal examination, replacement of damaged parts, and recharging if needed. The service date and technician name must be on a durable label.

NFPA 10 requires a 6-year internal examination for stored-pressure extinguishers. This goes beyond the annual maintenance — the extinguishing agent is removed, all internal parts are inspected for corrosion or caking, gaskets and valves are checked, and the unit is recharged with fresh agent. Many facilities skip this because it requires a service call — but an extinguisher that has never been internally examined may fail to discharge when needed.

1910.157(f): Hydrostatic testing verifies the structural integrity of the cylinder under pressure. CO2 and wet chemical extinguishers require testing every 5 years. Stored-pressure dry chemical every 12 years. A cylinder that fails hydrostatic testing must be destroyed — it cannot be repaired. The test date is stamped or stencilled on the cylinder body, not just the tag.

1910.157(e)(4): Records of annual maintenance must be retained. These are typically the service reports from the fire equipment company. OSHA inspectors review these documents and compare them against the labels on each extinguisher. Discrepancies between service records and extinguisher labels are cited as falsification of records in serious cases.

Prior fire incidents indicate systemic fire protection failures. An extinguisher that failed to suppress a fire, could not be located in time, or was found discharged during an incident reveals gaps in placement, maintenance, or training. Every incident must be investigated, corrective actions implemented, and the programme reviewed before returning to normal operations.

1910.157(g)(1): The employer must decide: will employees fight incipient fires, or will they evacuate? This decision drives training obligations. If the employer decides employees will only evacuate, no extinguisher training is required — but employees must be told they are not to attempt to fight fires. If any employee may be expected to use an extinguisher, that employee must be trained. An undocumented or inconsistent policy leaves the employer exposed to citation from both directions.

PASS: Pull the pin, Aim at the base of the fire, Squeeze the handle, Sweep side to side. Training must also cover: which extinguisher to use on which fire class, when NOT to fight (fire larger than a wastebasket, no clear exit behind you, smoke fills the room), and how to report a fire before attempting suppression. Hands-on training with a discharged unit or simulator is strongly recommended.

1910.157(g)(2): Annual retraining is required. One-time initial training does not satisfy the standard. Annual retraining must be documented with dates and employee names. OSHA inspectors ask designated employees when they were last trained — if employees cannot recall or the dates are more than 12 months ago, a citation typically follows.

1910.38: An EAP is required for all employers who must have an emergency action plan under any OSHA standard — which includes facilities with portable fire extinguishers under 1910.157. It must include: procedures for reporting a fire or emergency, evacuation procedures and emergency escape route assignments, procedures for employees who remain to shut down critical operations, means to account for employees after evacuation, and emergency rescue duties.

1910.38(c)(2): Emergency escape routes must be designated and communicated to employees. Posted evacuation maps must show the current location, all exits, and the designated assembly area. Exit signs must be illuminated. Blocked exits and locked exit doors are among the most serious OSHA fire safety citations — they have been directly responsible for mass casualty events in workplace fires.

Regular drills ensure employees know evacuation routes under stress — a smoke-filled or dark building looks very different from daily conditions. Drill records demonstrate programme compliance and can reduce liability after an incident. Unannounced drills during different shifts are best practice. Document the drill date, number of participants, time to full evacuation, and any issues observed.

1910.39: A Fire Prevention Plan is a separate document from the Emergency Action Plan. It must identify major fire hazards in the workplace, procedures for handling and storing materials that could cause fires, potential ignition sources and their control, the type of fire protection equipment needed for each major hazard, and the name or job title of the person responsible for maintaining fire prevention equipment. Employees must be briefed on the plan at the time of initial assignment.