Which replacement motor can I use for a USV central exhaust unit?

The correct replacement motor for a USV central exhaust unit depends on the type of mounting plate the unit has.

If the unit has an oval mounting plate and was produced after April 2002, a replacement motor with article number 98320 should be used.
If the unit has a round mounting plate and was produced before April 2002, a replacement motor with article number 98319 should be used.