Nevada used to conduct inspections every three years. Inspections are now done annually to ensure the safety of employees in businesses.Maintenance must be performed annually to ensure that all parts are in working order. Extinguishers are opened and the powder checked. Recharging is done once per year. The company performing the service tags the fire extinguisher with the date of service, license number and signature. These tags must be approved by the State Fire Marshall prior to being used. A collar punched with the current year is affixed to the fire extinguisher. The manufacturer’s label on the fire extinguisher must remain in clear sight. Business owners are required to do visual checks of all fire extinguishers monthly. If a new portable fire extinguisher has been purchased a receipt must be kept to prove the purchase date.