Trane UHSB Installation, Operation And Maintenance Manual page 26

Dimensional Data
Figure 27. Header Type Models 18 thru 360
Note: Motors are totally enclosed, thermally protected, sleeve bearing, with 4" (w) x 2" (h) conduit connection boxes.
3/8-16 nutserts are attached to enclosure for balanced hanging.
26 UH-SVX01A-EN