ActronAir Indoor Evaporator Fan Deck 12x9 S is the factory-specified fan deck for the SCA47 commercial package indoor unit, providing the airflow volume and static pressure profile required for the SCA47 coil configuration and its commercial duct system. Fan decks on commercial package units operate at higher duty cycles than residential units -- periodic inspection for bearing wear and impeller blade erosion is recommended at every service visit. Isolate power at mains before replacement -- live work on fan assemblies is dangerous and must only be performed by a qualified technician.