ActronAir Fan Twin Deck 9x7 1HP ECM ELGEE is the standard twin-deck assembly for AIRES and Advance R32 indoor units, providing 1HP ECM variable-speed airflow through the dual-impeller configuration these systems use to deliver high-volume, low-noise conditioned air. Twin-deck assemblies distribute the airflow load across two impellers, reducing individual blade stress and operating noise compared to single large-impeller designs at equivalent airflow volumes. Isolate power at mains before replacement -- live work on fan assemblies is dangerous and must only be performed by a qualified technician.