Delaware Fire Marshal issues warning about unapproved lithium battery Class 'L' fire extinguishers

The Class ‘L’ fire extinguishers are not approved in Delaware. (Photo by IFSEC Global)

The Delaware Office of the State Fire Marshal is warning residents against the use of Class “L” fire extinguishers, a new type of device being marketed for use on lithium battery fires.

According to state officials, these extinguishers have not been tested or approved by a recognized third-party laboratory such as Underwriters Laboratories (UL), which raises serious concerns about their effectiveness and safety.

While lithium battery fires are a growing concern, the Office wants to ensure that residents are using only equipment that meets current safety standards.

Under Delaware’s current fire code — the 2021 State Fire Prevention Regulations — fire protection devices must be listed and approved.

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Since Class “L” extinguishers do not meet that requirement, they are not permitted for use in the state.

The National Fire Protection Association’s 2022 edition of NFPA 10, the standard for portable fire extinguishers, also does not recognize Class “L” as an approved classification.

The standard continues to officially designate Class A, B, C, D, and K extinguishers, all of which are tested and approved for use in Delaware.

Officials are urging the public to use only listed fire extinguishers and to consult with fire safety professionals if they have questions about protecting their homes or businesses from battery-related fires.