... .5M, and color depend on cusomer require, Also the small duct, size is 520*360mm, length is also ... , And also have a connector to connect the big and small duct, this size is from 650*450mm ... size is 650*450mm. In the end of the duct, we have the big end cap and the small end cap. 2013 insrall air ... cooler use the plastic duct ...