2505-141K 450mm Outdoor Fan Kit drives condenser airflow across the outdoor coil on ESP Plus and Advance R32 residential split ducted systems, rejecting heat from the refrigerant circuit to maintain rated cooling and heating capacity at all operating conditions. This assembly uses a ECM 1 Phase AC axial fan motor (ECM) -- when the outdoor fan fails, the condenser coil cannot reject heat, causing rapid high-pressure faults and compressor lockout on hot days. Isolate power at mains before replacement -- ECM motor drives retain residual voltage after power isolation.