The 1600 series is a resilient mount design, to help reduce vibration transmitted into the piping. Resilient mount motor is supported by a bracket. If you apply an upward force on the bracket, either by a hanger or a foot support on the floor, it is possible to distort the alignment, causing premature, uneven wear on the seal faces, and stress on the bearings. The piping should be rigid enough to support the overhung load of the motor, but be careful of torsional stress on the piping. To prevent that, you may have some type of foot support or hanger, without pulling on the motor, just adding some support.