https://www.cicecool.com/use-and-maintenance-of-standing-freezer.html Only by correct use and careful maintenance of the commercial grade upright freezer can maximize its effect. Use and Maintenance of Commercial Grade Upright Freezer First, the standing freezer should be placed on a flat floor. The indoor environment of the freezer should be well-ventilated and dry with a top more than 50cm from the ceiling. The left and right sides should keep more than 20cm from other objects, and the back more than 20cm from other objects. Moreover, the standing freezer should be left standing for 2 to 6 hours before starting up after purchasing or transportation. Before use, the empty cabinet should be powered on for 2 to 6 hours. Do not start immediately after downtime, please wait for more than 5 minutes in order to avoid burning out the compressor.