There are a variety of specifications of roller kiln, common sizes are: the length is 15 meters, 18 meters, 24 meters, 30 meters, 36 meters, 42 meters, etc., the width is between 1.2 meters and 6 meters, and the height is generally 3 meters. The units of length and width are millimeters, and the units of height are centimeters. Which specifications to use depends on the type of product being produced and production needs.