ActronAir Indoor Evaporator Fan Deck 15x11 S (Counter-Clockwise Rotation) is a large-format fan deck for higher-capacity Classic Series indoor units, specified in counter-clockwise rotation to match the coil and housing geometry of the target unit. Rotation direction is critical -- fitting a clockwise-rotation deck in this application reduces airflow by up to 30% and can cause backward-running motor overheating. Isolate power at mains before replacement -- live work on fan assemblies is dangerous and must only be performed by a qualified technician.