Which type of extinguisher maintenance can a Class E license perform?

A Class E license specifically allows a technician to conduct internal maintenance and recharging of carbon dioxide extinguishers. This type of extinguisher contains carbon dioxide as its primary agent, which requires specialized knowledge and adherence to safety protocols during maintenance and recharging procedures.

In contrast, the internal maintenance of dry chemical extinguishers involves different protocols and is typically not covered by a Class E license. The option that states only external maintenance for classifications B and C refers to a more limited scope of services that a Class E license does not encompass, as the internal work with extinguishers necessitates more detailed training and compliance with specific standards. Moreover, general maintenance on any type of fire extinguisher would exceed the qualifications granted by a Class E license, which is narrowly focused on carbon dioxide extinguishers. Thus, the answer highlights the specific capabilities and legal qualifications provided under a Class E license.