UPS is designed to operate maintenance free. Nevertheless, certain steps will extend its life time! We recommend the following: • Regularly check if the unit’s operating environment is still within the recommended conditions • For the best preventive maintenance, keep the area around the UPS clean and dust-free. If the atmosphere is very dusty, clean the outside of the UPS with a vacuum cleaner • Unplug the UPS prior to cleaning and do not use liquid or spray detergent • Use dry soft clothes to clean the front panel and plastic parts. Take special care for the air inlets for the fans proper funcitioning