Part # 990476. This is an original replacement part for a Renewaire EV90P. The replacement part consists of the impeller and the motor assembly together as one part. This unit takes (2) of these parts, one for the fresh air intake and the other for the exhaust air. This makes it very easy to replace, just remove the old damaged assembly and install the new one. The wiring is done through a quick connect cable terminal. Just make sure that the unit is unplugged before attempting to replace the Impeller assembly.