ActronAir Indoor Evaporator Fan Deck 10x10 S (2x3/4HP) ECM uses two matched 3/4HP ECM motors on a single 10x10 deck, providing redundant airflow capacity and balanced static pressure distribution across the indoor coil for large multi-zone systems. The twin-motor configuration requires both motors to be replaced as a matched pair -- replacing one motor only causes speed imbalance and vibration that accelerates failure of the remaining motor. Isolate power at mains before replacement -- live work on fan assemblies is dangerous and must only be performed by a qualified technician.