Hewlett Packard C9518A Maintenance Kit, Operating Temperature: 41 to 104 °F (5 to 40 °C), Storage Temperature: 41 to 104° F (5 to 40 °C), Operating Humidity: 20 to 80% RH, Storage Humidity: 20 to 80% RH. The Original HP Maintenance Cartridge is designed to make your HP Designjet printer even easier to use by enhancing system reliability.