ActronAir Indoor Evaporator EC Plug Fan K3G400PI9202 400mm 3-Phase is a 400mm EC plug fan using the PI9202 motor configuration for commercial ducted systems where variable-speed airflow control is managed via 0-10V signal from the commercial indoor PCB. The K3G400 series uses a different impeller attachment method to the K3G355 series -- do not attempt to swap impellers between motor models as impeller balance and clearance specifications differ between these ranges. Isolate power at mains before replacement -- EC motors and variable drives retain dangerous residual voltages for up to 5 minutes after power isolation.