Fire Extinguisher Placement and the Monthly Tag
Why this matters
A shop can own six extinguishers and still have none where it needs one: two by the front door, one behind the parts washer, one in a truck, one on the floor under a bench with its pin missing, one whose gauge has read empty since spring. Placement is a distance measured on foot, and condition is a ten-second look once a month that somebody has to actually do and write down. An inspector checks both by walking the floor and turning over the tags. A fire checks them faster.
Which rule reaches you
OSHA, for the employer. 29 CFR 1910.157 applies to employers in general industry that provide portable extinguishers for employee use. It sets distribution, inspection, maintenance, hydrostatic testing and training.
The exemption, with all its conditions. Under 1910.157(b), an employer that has a written fire safety policy requiring immediate and total evacuation when the alarm sounds, with an emergency action plan and a fire prevention plan meeting 1910.38 and 1910.39, and that does not provide extinguishers at all, is exempt from the section unless another standard requires an extinguisher. Where extinguishers are present but the written policy says employees evacuate and do not use them, the employer is relieved of the distribution rules but must still inspect, maintain and test the units that are there. Most small shops expect a tech to grab an extinguisher on a small fire, so neither half applies and the whole section does.
The fire code, for the building. The fire code as your jurisdiction adopted it requires extinguishers in most commercial occupancies and points to NFPA 10 for selection, placement and maintenance, in the edition it references. That binds the building and its occupant through the fire marshal, whether or not the shop has employees. Where NFPA 10 and OSHA differ, meet the stricter. What the letters and numbers on the label mean is covered in What a Fire Extinguisher Rating Actually Means; this card is about where they hang and how they are kept.
Placement is travel distance, walked
OSHA's distribution rules measure travel distance: the actual walking path from any point in the area to the nearest extinguisher, around benches, racks and walls. A circle drawn on a floor plan is not travel distance.
- Class A hazards (wood, paper, cardboard, plastics, ordinary combustibles): travel distance of 75 feet or less, under 1910.157(d)(2).
- Class B hazards (flammable liquids, fuels, solvents): travel distance of 50 feet or less, under 1910.157(d)(4). NFPA 10 can be stricter: it pairs the distance with the extinguisher's B rating, so a unit with a smaller B rating may be allowed only 30 feet in the edition your code references.
- Class C hazards (energized electrical equipment) are covered on the basis of the A or B hazard nearby, under 1910.157(d)(5).
- Class D (combustible metals) and Class K (cooking oils) have their own rules; a field-service shop rarely has either, but a shop that machines magnesium or runs a commercial fryer does.
NFPA 10 also limits the floor area each unit may protect by its A rating, which matters in a big open building more than in a typical shop where the 75-foot walk governs first.
Mounting and visibility
NFPA 10 sets the heights. An extinguisher with a gross weight of 40 pounds or less is mounted so its top is not more than 5 feet above the floor. One over 40 pounds has its top not more than 3.5 feet up. The bottom is at least 4 inches off the floor. A typical 10-pound unit weighs well under 40 pounds with its contents, so it hangs with its top at or under 5 feet.
OSHA's 1910.157(c)(1) wants extinguishers mounted, located and identified so they are readily accessible without subjecting anyone to injury. In practice:
- On a hanger or in a cabinet, not on the floor, where a cart or a pallet jack can bury it.
- On the path people travel, near exits, so someone grabs it on the way toward the fire with the way out behind them.
- Not blocked. Keep a clear zone in front; a shop default is 3 feet, marked on the floor if things keep getting stacked there.
- Visible, or marked with a sign high enough to be seen over racks and vehicles where it is not.
The monthly inspection
1910.157(e)(2) requires a visual inspection at least monthly. NFPA 10 describes what that inspection covers, and it is quick:
- In its assigned place, mounted, not blocked, visible or signed.
- Pressure gauge, where there is one, in the operable range (the green arc).
- Pin and tamper seal intact.
- Full: lift it. A unit noticeably light against its neighbors has discharged or leaked.
- No visible damage, corrosion, leakage, or clogged nozzle or hose.
- Operating instructions on the nameplate legible and facing out.
Anything that fails goes out of service and gets replaced from a spare or by the servicer that day; an empty hanger is marked so nobody assumes coverage.
NFPA 10 requires the monthly inspection to be recorded, with the date and the initials of the person who did it, on the tag or in an electronic log. The monthly check is a shop job. It is not maintenance.
Annual maintenance and the longer intervals
Annual. 1910.157(e)(3) requires an annual maintenance check, and the employer keeps a record of the annual maintenance date for one year after the last entry or the life of the shell, whichever is less. Under NFPA 10 and many state licensing laws, annual maintenance is done by a certified or licensed servicer, who punches the tag.
Six-year and hydrostatic. Stored-pressure dry chemical units with a 12-year hydrostatic test interval also get an internal maintenance every six years under NFPA 10. OSHA's hydrostatic test intervals in 1910.157(f) include 12 years for stored-pressure dry chemical and 5 years for carbon dioxide and for water types. The servicer tracks these from the manufacture date on the cylinder.
The tag, front and back
FRONT (punched by the servicer)
+--------------------------------------------+
| PORTABLE EXTINGUISHER SERVICE TAG |
| Unit: E-1 Dry chemical ABC Size: 10 lb |
| Rating: 4-A:80-B:C Manufactured: 2017|
| Annual maint by: servicer, cert no. ______ |
| YEAR: 25 [26] 27 28 |
| MONTH: J F M A M J J A [S] O N D |
| 6-yr maint: 2023 Hydro test due: 2029 |
+--------------------------------------------+
BACK (initialed by shop staff each month)
| MONTH | DATE | INIT | GAUGE | PIN/SEAL |
| OCT | 10/02 | MR | green | intact |
| NOV | | | | |
| DEC | | | | |
Read it the way an inspector does. The punched year and month show annual maintenance in September 2026. The unit was made in 2017, so its six-year maintenance fell in 2023 and its 12-year hydrostatic test falls in 2029; both match the tag. The back shows October's monthly check. If an inspector arrives in late November and the November line is blank, the shop has missed a monthly, however good the unit looks.
A worked example: walking the floor
A ten-person plumbing shop, one building: a front office, an open shop floor about 90 feet deep, a parts room off the side, and a flammable liquid cabinet in the back corner. Two extinguishers on hand, both 10-pound 4-A:80-B:C units: E-1 at the office door, E-2 beside the overhead door halfway back.
The flammable cabinet, a Class B point. The owner walks from the cabinet to the nearest extinguisher, E-2: 48 feet down the back aisle and 22 feet across, 48 + 22 = 70 feet. That clears the 75-foot Class A distance and fails the 50-foot Class B distance by 20 feet. A third unit, E-3, goes on the column along the path from the cabinet to the rear exit, 18 feet from the cabinet, so someone approaches the fire with the exit behind them.
The far corner of the parts room, a Class A point. Shelving full of boxed fittings. Walking out through the parts room door and up the aisle to E-2: 62 feet plus 21 feet, 62 + 21 = 83 feet. Over 75 by 8 feet. Measured on the floor plan as a straight line it was 58 feet, which is how it had passed for years. E-4 goes on the wall just inside the parts room door; the far corner is now 34 feet from it on foot.
Recheck every point. The owner walks from the four corners of the shop floor and the back of the office to the nearest unit; none is over 75 feet, and the cabinet is 18 feet from E-3. Four units, four hangers, top of each at 4 feet 8 inches, under the 5-foot limit.
What would have changed it. If the shop had written a total-evacuation policy with no employee use of extinguishers, OSHA's distance rules would no longer bind, but the fire code would still require units placed under NFPA 10 and the two already on the wall would still need monthly inspection. If the cabinet had held only lubricating oils instead of gasoline and primer, nothing would change: OSHA's definition of a Class B fire (1910.155) includes combustible liquids, greases and oils, so the 50-foot distance would still apply.
Training is part of the section
Where employees are expected to use extinguishers, 1910.157(g) requires the employer to train them on the general principles of extinguisher use and the hazards of fighting an incipient fire, on initial employment and at least annually. Training that includes actually discharging a unit at a controlled practice fire, run by the servicer or the fire department, is what turns a wall fixture into something a tech will use correctly.
References
- 29 CFR 1910.157, portable fire extinguishers, and 29 CFR 1910.38 and 1910.39, emergency action and fire prevention plans, OSHA general industry
- NFPA 10, Standard for Portable Fire Extinguishers, in the edition your fire code references, as adopted by your jurisdiction
- See related: What a Fire Extinguisher Rating Actually Means