ActronAir Indoor Evaporator Fan Blower 15x15 S is a large-format blower for higher-capacity Classic Series residential and light commercial indoor units, providing the airflow volume needed to maintain adequate coil face velocity and heat exchange efficiency at the higher tonnage end of the residential range. The 15x15 impeller size creates a higher inertia load at startup than smaller blowers -- correct capacitor sizing is critical to ensure reliable single-phase motor starting on each power cycle. Isolate power at mains before replacement -- live work on fan assemblies is dangerous and must only be performed by a qualified technician.