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In early 2020, the COVID-19 pandemic broke out in Wuhan. The city decided to build the Huoshenshan Hospital on an emergency basis, following the model of Beijing's Xiaotangshan Hospital, to centralize the treatment of severely ill COVID-19 patients. With a total construction area of more than 30,000 square meters, the hospital's ward areas were designed as negative-pressure isolation wards, placing extremely high demands on the ventilation system in terms of tightness, stability, and negative-pressure maintenance.

After receiving the urgent request, the production, technical, quality, and after-sales teams were quickly organized to work overtime, completing the R&D, production, factory inspection, and batch delivery of 880 ventilation units within ten-odd days. The total value of all units was approximately RMB 1 million, and they were all used in the ventilation systems of the negative-pressure isolation wards, ICUs, operating rooms, and medical staff corridors of the Huoshenshan Hospital.

The core of the negative-pressure isolation ward ventilation system is to maintain lower air pressure inside the wards than in adjacent areas to prevent the virus from spreading outward with the airflow, while safely discharging the virus-containing air after high-efficiency filtration. Rotor's 880 ventilation units were produced in accordance with the technical requirements of the negative-pressure isolation ward ventilation system: unit leakage rate was strictly controlled; the filter section used three-stage filtration including primary, medium, and high-efficiency filters; the fan section used variable-frequency control to allow real-time adjustment of airflow volume and negative pressure; and the fresh-air and exhaust-air ducts were equipped with electric sealed valves to ensure isolation.

In terms of production organization, all units were manufactured overtime in the factory, strictly factory-inspected, and delivered in coordination with the design and construction units in batches. The large quantity, varied specifications, and tight schedule of the 880 units posed significant challenges to production scheduling, quality control, and logistics. The team ensured that all units arrived at the Wuhan site on schedule through reasonable scheduling, parallel production, batch inspection, and shipment-by-vehicle arrangements.

After the 880 units arrived at the site, technical personnel were arranged to cooperate with the construction unit for installation, commissioning, and acceptance, ensuring that the ventilation system operated stably according to the design requirements. The successful delivery of this project represents another successful practice by Rotor in a major public-health emergency project, following Rotor's participation in several major sporting events.