This type of dehydrator has a heater but no fan. Rotate the layers often to keep the bottom ones from drying out, and avoid the bottom layers altogether with tomatoes. Not as fast as those with fans, but quieter and less electricity use.
Kitchen Share NE
https://www.kitchencommons.net/projects/kitchen-share-ne
5431 NE 20th Avehttps://www.kitchencommons.net/projects/kitchen-share-ne
Portland, OR, 97211
USA