ActronAir Indoor Evaporator Fan Blower 9x9 S 315W is the low-wattage variant in the 9x9 blower range, suited to small-capacity Classic Series indoor units where the 315W motor rating matches the reduced coil area and shorter duct runs of entry-level systems. The 315W rating uses a 4uF run capacitor -- this is a smaller capacitor than the 9x9 S 425W and 600W variants, and substituting a higher-rated capacitor from those assemblies will cause overcurrent and premature motor failure. Isolate power at mains before replacement -- live work on fan assemblies is dangerous and must only be performed by a qualified technician.