Fire Extinguisher Mounting Height: NFPA 10, OSHA, and ADA Rules for Brackets and Cabinets

How high to mount a fire extinguisher comes down to two numbers from two rulebooks. NFPA's placement guidance for NFPA 10 puts the top of the extinguisher no more than 5 ft above the floor (3.5 ft when the unit weighs more than 40 lb) with its bottom at least 4 in. off the floor, and the 2010 ADA Standards cap anything hanging on a wall between 27 in. and 80 in. at 4 in. of projection into the circulation path. OSHA requires the mounting but sets no height of its own. Mount to satisfy all three, then confirm the edition your authority having jurisdiction (AHJ) enforces.

Who writes the rules

• NFPA 10, Standard for Portable Fire Extinguishers (National Fire Protection Association) sets selection, distribution, and installation height. The figures here come from two public NFPA pages, the Fire Extinguisher Location and Placement fact sheet (December 2024, written to the 2022 edition) and the Extinguisher Placement Guide blog (April 2021).
• OSHA 29 CFR 1910.157 covers extinguishers provided for employee use. Paragraph (c)(1): "The employer shall provide portable fire extinguishers and shall mount, locate and identify them so that they are readily accessible to employees without subjecting the employees to possible injury." No paragraph in the section gives a height in inches or feet.
• The 2010 ADA Standards (U.S. Access Board), section 307.2, never mention extinguishers. They govern any object projecting into a circulation path, which the Standards define to include "walks, hallways, courtyards, elevators, platform lifts, ramps, stairways, and landings."

The height band in NFPA's words

NFPA's fact sheet splits the rule by weight. Under 40 lb: "Top of extinguisher cannot be more than 5 ft (1.53 m) from the ground" and "Bottom of extinguisher must be at least 4 in. (102 mm) off the ground." Over 40 lb: "Top of extinguisher cannot be more than 3.5 ft (1.07 m) from the ground", with the same 4 in. at the bottom. Wheeled units are exempt, and one line matters for cabinets: "In both cases, this includes extinguishers in cabinets, but it does not include wheeled extinguishers."

The 40 lb break is the weight of the extinguisher, so read the gross weight on the manufacturer's data sheet, not the agent size in the model name.

The protrusion limit in ADA's words

ADA 307.2 reads: "Objects with leading edges more than 27 inches (685 mm) and not more than 80 inches (2030 mm) above the finish floor or ground shall protrude 4 inches (100 mm) maximum horizontally into the circulation path." The one exception is handrails, permitted "4 1/2 inches (115 mm) maximum", and it does not cover extinguishers or cabinets. The advisory explains the 27 in. figure: an element in the cane-detectable range "gives a person sufficient time to detect the element with the cane before there is body contact."

So: top of the extinguisher at 5 ft (60 in.) or lower, bottom at 4 in. or higher, and no more than 4 in. off the wall between 27 in. and 80 in. wherever the wall is a circulation path. Going above 80 in. to escape the band is not an option, because NFPA caps the top at 5 ft.

Fire extinguisher bracket height

A wall bracket is the simplest way to hit the NFPA figures, and it does nothing about projection.

1. Read the gross weight on the data sheet: under 40 lb, top limit 5 ft; over 40 lb, 3.5 ft (42 in.).
2. Hang the extinguisher, then measure from the finished floor to the highest point of the unit. NFPA measures the extinguisher, not the bracket, so the screw height is not the figure anyone checks.
3. Move the bracket until that reading is at or under the limit, with the bottom of the cylinder at least 4 in. clear of the floor.
4. Measure how far the unit stands off the wall, cylinder and bracket together. Over 4 in., with the bottom of the unit inside the 27 to 80 in. band, 307.2 applies and the bracket alone cannot meet it.
5. Use a bracket the manufacturer lists for the model; NFPA says hangers and brackets "need to be intended for the extinguisher".

That is how a corridor meets NFPA 10 and fails ADA 307.2 at once: right height, wrong projection. Move the bracket to a room or an alcove off the path of travel, or move to a cabinet.

Fire extinguisher cabinet height

The same two rules apply, to the extinguisher inside and to the cabinet body. NFPA's height limits include extinguishers in cabinets, so the top of the unit on its cabinet bracket still has to be at or under 5 ft (or 3.5 ft) with 4 in. below it, and that fixes where the cabinet goes once you know the extinguisher's height. Projection is then the cabinet's own: a surface cabinet stands off the wall by its full depth, a semi-recessed one by its trim, a recessed one by its trim edge only. In a circulation path the trim is what has to land at 4 in. or less, which is why semi-recessed and recessed cabinets exist. Choosing the cabinet, fire-rated walls and glazing included, is our fire extinguisher cabinet guide.

The rules in one table

Placement rules that travel with the height

Height is not the only thing an inspector checks. NFPA's guidance also says extinguishers "need to be located along normal paths of travel", visible, with a sign where an obstruction is unavoidable. Distribution runs on travel distance and, for Class A, floor area: NFPA gives a 75 ft maximum travel distance and 11,250 sq ft maximum coverage per extinguisher, and points to Tables 6.2.1.1 and 6.3.1.1 of NFPA 10; its fact sheet gives Class B 30 ft to 50 ft by hazard and rating, and Class K 30 ft from the cooking hazard. OSHA's 1910.157(d)(2) matches Class A at "75 feet (22.9 m) or less", and (c)(4) wants extinguishers "kept in their designated places at all times except during use."

What to send with a quote

Extinguishers and cabinets are a quote line for us, not a cart item. Send the extinguisher class and size, with the gross weight if you have it; the count and where each goes; the wall type (stud, masonry, glass) and whether it is fire rated; corridor or room for each location; and, for a cabinet, the depth available for recessing. We quote fire extinguishers, brackets, and the fire extinguisher cabinets that hold them at the right height, and can fold both into a Division 10 package. Start at Request a quote.