The APC InRow RD (300mm width) is a row-based precision air-conditioning unit designed to sit directly within a server rack row in a data centre, delivering cooling right at the source of heat rather than relying solely on room-level air conditioning. This in-row approach is used to manage high-density racks where traditional perimeter cooling can't keep up, improving airflow predictability and reducing hot spots. It's specialised data-centre infrastructure, not a general-purpose air conditioner — bought by data centre operators and large server-room owners as part of a broader precision-cooling deployment, often alongside APC's own UPS and rack enclosure lines.