The portable fire extinguisher triad — defining “readibly accessible”
A portable fire extinguisher provides zero benefit if the employee can’t access it. To counter this, OSHA created requirements relating to fire extinguisher placement based on travel distance between the employee and the fire extinguisher. This distance will vary depending on the type of fire.
Note that local ordinances or insurance agency expectations may be more stringent. The OSHA requirements described here apply only if the employer provides extinguishers for employee use.
OSHA specifies in 1910.157(c)(1) that employers provide portable fire extinguishers and mount, locate, and identify them so that they are readily accessible to employees. While lacking a formal definition, the term “readily accessible” typically means immediately available and within normal paths of travel. To help fill in the gaps regarding mounting, locating, and identifying, the National Fire Protection Agency (NFPA) offers additional guidance.
Mounting
Depending on the type and size, portable fire extinguishers should be mounted on brackets or in wall cabinets to prevent them from being moved or damaged. Those with a gross weight of 40 pounds or less should be mounted with their carrying handles no higher than 5 feet from the floor. Any fire extinguishers over 40 pounds need to be mounted with their carrying handles no more than 3 ½ feet from the floor. All portable fire extinguishers need to have at least 4 inches of clearance between their bottoms and the floor.
Locating
You can usually find portable fire extinguishers in offices, hallways, storage areas, meeting rooms, kitchens, mechanical/electrical rooms, and near exit doors. The fire extinguisher must be positioned based on the potential type and size of fire that can occur.
- Class A (combustible material fire) – OSHA requires access to an extinguisher within 75 feet of travel distance. NFPA recommends one extinguisher for every 3,000 square feet.
- Class B (flammable liquid fire) – OSHA requires access within 50 feet. NFPA identifies different sizes of extinguishers and variable spacing depending on the hazards present. This varies from low hazard requiring a 5-B extinguisher every 30 feet to a high hazard requiring an 80-B extinguisher every 50 feet.
- Class C (electronic equipment fire) – extinguisher size and spacing is based on its Class A or B hazard.
- Class D (combustible metal fire) – OSHA requires access within 75 feet from the hazard.
- Class K (cooking media fire) – OSHA requires access within 30 feet from the hazard.
Identifying
While not specified in the OSHA standard, NFPA does mention that in areas where fire extinguishers aren’t visible due to obstructions, signs or other means must be provided to indicate the extinguisher location. It is seen as a best practice, especially when extinguishers are stored in a cabinet, to mount a sign near the extinguisher to identify its location.
By looking further into the regulations and NFPA guidance, employers can assure that extinguishers are available in a way that is compliant with OSHA requirements, are available if a fire occurs and those extinguishers are needed immediately.