... 520*360mm, length is also 1.5M, And also have a connector to connect the big and small duct, this size is from 650 ... we make the elbow for the big duct, like we install the duct need to change the side, we have left& right elbow, and also the up ... duct, 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 ...