Many inventions have been created to solve the various problems arising from the COVID-19 pandemic. The innovation of negative pressure cabinets plays an important role in reducing the risk of spreading the virus between medical personnel and other patients through coughing and sneezing. This invention functions in a similar way to quarantine rooms which use negative and positive pressure with separate ventilation systems. There is less air pressure inside than outside the room. Airflow is controlled to prevent germs from spreading so that the air from inside the room does not flow to the outside.

The concept of airflow control stems from the knowledge acquired in the field of mechanical engineering. It applies to many situations, especially the airflow in a negative-pressure room. Due to the emergence of COVID-19, many solutions have been proposed, including
negative pressure cabinets. However, the airflow, as well as the droplet transport inside the cabinet, has not yet been investigated.

Assoc. Prof. Weerachai Chaiworapuek of Kasetsart University has conducted a study through the Special Program for Research Against COVID-19 (SPRAC) and upgraded the negative pressure cabinet to make it more efficient, contributing to the existing knowledge in engineering and healthcare management. This research project represents not only a collaboration between Thai and Japanese universities but also the Siriraj Hospital which provides support in terms of the location, information, equipment, and related standards necessary for the invention of a positive pressure cabinet and negative pressure room.

In the future, this research project can be applied to predict droplet spread by coughing and sneezing in public areas such as buses, airplanes, trains, shopping malls, and workplaces.

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