ActronAir Indoor Evaporator Fan Deck 9x9 S 750W delivers higher static pressure than the 600W 9x9 variant, suited to ESP Plus and Classic Series indoor units where longer or more restrictive duct runs require greater motor output to maintain airflow at all zone registers. The 750W motor with 20uF run capacitor is the highest-wattage option in the 9x9 deck range -- specifying this deck on a system designed for the 600W variant will cause over-pressurisation and excessive airflow through open zones. Isolate power at mains before replacement -- live work on fan assemblies is dangerous and must only be performed by a qualified technician.