How often should a fire extinguisher be dismantled and check by a technician?

Fire extinguishers should be inspected monthly by a designated individual for any visible signs of damage or tampering. A qualified technician should perform a thorough maintenance check at least annually, which includes dismantling the extinguisher to ensure all components are functioning properly. Additionally, any extinguisher that has been used, even briefly, should be serviced immediately. Regular checks help ensure reliability in emergencies.