ActronAir Indoor Evaporator Fan Blower 18x18 S (Blower Impeller Only -- Motor Not Included) is an oversized blower impeller and housing assembly for large-capacity Classic Series commercial and residential ducted systems, where the 18-inch wheel diameter delivers the high airflow volumes required by large indoor coils. This part supplies the blower impeller and housing only -- the motor must be ordered separately and matched to the system electrical specification. Isolate power at mains before replacement -- live work on fan assemblies is dangerous and must only be performed by a qualified technician.