What is the maximum travel distance to a fire extinguisher with a 20-B rating for an ordinary (moderate) type hazard?

According to NFPA 10, Standard for Portable Fire Extinguishers, the placement and distribution of extinguishers for Class B hazards are determined by the type of hazard. Table 6.3.1.1 specifies the requirements for fire extinguisher size and placement for Class B hazards. For an area classified as an "Ordinary (moderate)" hazard, the maximum travel distance from any point to the nearest fire extinguisher shall not exceed 50 ft (15.25 m). The 20-B rating of the extinguisher meets the minimum requirement (10-B) for this hazard level, but the travel distance is dictated by the hazard classification itself.

A. 30 ft (9.14 m) is the maximum travel distance specified for a light (low) Class B hazard, not an ordinary hazard.

C. 75 ft (22.86 m) is the maximum travel distance specified for Class A hazards, regardless of the hazard level.

D. 100 ft (30.48 m) is not a standard maximum travel distance for Class B hazards as defined in NFPA 10.

1. NFPA 10, Standard for Portable Fire Extinguishers (2022 Edition).

Section 6.3.1.1: "The maximum travel distances to extinguishers for Class B hazard protection shall be in accordance with Table 6.3.1.1."

Table 6.3.1.1, "Fire Extinguisher Size and Placement for Class B Hazards": This table explicitly lists the "Maximum Travel Distance to Extinguishers" for an "Ordinary (moderate)" hazard as 50 ft (15.25 m).

2. SFPE Handbook of Fire Protection Engineering, 6th Edition.

Chapter 48, "Portable Fire Extinguishers": This chapter discusses the application of NFPA 10 standards. In the section on "Distribution of Fire Extinguishers," it reiterates the travel distances specified in NFPA 10, Table 6.3.1.1, confirming that for ordinary Class B hazards, the maximum travel distance is 50 ft (15.25 m). (DOI: https://doi.org/10.1007/978-3-030-94354-348)