If an extinguisher weighs less than 40 lbs, the carrying handle should be no more than 5 ft from the ground. Any heavier than 40 lbs and the handle should be no more than 3.5 ft from the floor. These heights reflect the requirement that employees should be able to access a fire extinguisher without risking an injury.
Extinguishers need to be installed at least 4 inches off the ground up to a maximum of 5ft. The exception to this is for extinguishers heavier than 40 lbs, they can only be up to 3 ft 6 inches off the ground and wheeled fire …
NFPA Requirements For Mounting a Fire Extinguisher
Fire extinguishers can only be mounted between 4 inches and 5 ft. from the ground to the top of the canister. However, fire extinguishers that weigh more than 40 lbs. can only sit a maximum of 3ft. 6 in. off the ground to the top of the canister. If the fire extinguisher is wheeled, it does not require mounting.
This is based on the type of extinguisher (and/or the Class of fire it can put out), as listed below. Placement of portable fire extinguishers for Class A fires Portable fire extinguishers must be placed so that the travel distance for employees to any extinguisher is 75 feet or less. — see 1910157(d)(2)
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Does a fire extinguisher have to be above the ground?
OSHA requires fire extinguishers to be at least four inches above the ground, meaning you cannot store them on the floor. Does a fire extinguisher have to be mounted upright? The pressure within the extinguisher holds its contents and thus allows you to store it horizontally if you wish.
How far can a Class A fire extinguisher travel?
If Class A extinguishers are placed at the limit of their maximum travel distance then people might have to travel the entire 75 ft to get the extinguisher and then back another 75 ft to return to the fire in order to extinguish it.
How close to a fire extinguisher can an employee have access?
Employees should have access to a fire extinguisher within either 30 or 50 feet, depending on the hazard in question and the rating of the extinguisher (see below).
What is the maximum floor area a fire extinguisher can cover?
This maximum floor area that a single extinguisher can cover is directly related to the numerical A rating and level of hazard occupancy but reaches a maximum of 11,250 ft 2. It is important to know both the maximum travel distance and floor area per extinguisher since you need to follow the most restrictive of the two.
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Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher