Based on this product's specifications, here are some alternatives and similar models
Rack accessory Rittal 3286.850 — white plastic housing, airflow duct for rooftop cooling unit
Summary description:
Rittal 3286.850 rack accessory is a white plastic airflow duct designed for rooftop cooling units. The component provides guided ventilation within server racks or enclosures, helping direct cooled air from roof-mounted cooling devices. Suited for data centers and industrial equipment enclosures where managed airflow and cooling distribution are needed.