Desktop air curtain system prevents spread of COVID-19 in hospital settings

Desktop air curtain system prevents spread of COVID-19 in hospital settings
DACS tested on patient at Nagoya University Hospital. Credit: Junki Mikami (FUIGO)

In efforts to prevent the spread of COVID-19, miniaturizing air curtains for hospital wards, labs, and other health care settings is gaining traction as a viable solution to inadequate face masks or when social distancing is not a realistic option.

In AIP Advances, researchers in Japan developed a desktop air curtain system (DACS) that blocks all incoming particles.

"We envisage this system will be effective as an indirect barrier for use in blood-testing labs, hospital wards, and other situations where sufficient physical distance cannot be maintained, such as at a reception counter," co-author Kotaro Takamure said.

An air curtain, or air door, is a fan-powered ventilation system that creates an air seal over an entryway. Hospitals use them to prevent ambulance fumes and other contaminants from reaching the inside of an emergency room.

One challenge in developing smaller air curtains is fully blocking emitted aerosol particles over time because it is difficult to maintain the air wall over a long distance. As a result, the devices gradually lose air-discharge intensity, creating a that allows infected aerosol particles to escape into the surrounding environment.

The DACS contains a discharge and suction port to help address this problem. A generator at the top of the DACS produces the airflow, which is guided to the suction port at the bottom of the device. This prevents airflow dispersion, thus leading to the collection of all the aerosol particles at the suction port. A high-efficiency particulate air (HEPA) filter can be installed inside the suction port for air purification.

The researchers are developing an accompanying virus inactivation system equipped with that connects to the suction port. After the air is sanitized with the UV light, it is recirculated to maintain airflow of the air curtain and air pressure in the room.

The researchers tested their device by using an air compressor connected to a mannequin to simulate breathing. Dioctyl sebacate, a widely used solvent that spreads easily, was added to the airflow to create aerosol particles. Particle image velocimetry and high-speed cameras were used to determine the DACS's blocking effect.

The aerosol particles approaching the DACS abruptly bent toward the suction port, signifying that air curtain flow fully blocked all incoming .

When the researchers placed the mannequin's arm through the DACS to imitate a blood-collection scenario, they found the airflow above the arm was disrupted. However, the aerosol blocking performance remained unaffected.

The DACS was tested on patients during blood collection at Nagoya University Hospital. The researchers are looking at lowering the suction , so the arm can be placed below the heart for proper blood collection.


Explore further

Study finds amounts of exhaled aerosol from vigorous exercise and conversational speaking are similar

More information: Blocking effect of desktop air curtain on aerosols in exhaled breath, AIP Advances (2022). DOI: 10.1063/5.0086659
Journal information: AIP Advances

Citation: Desktop air curtain system prevents spread of COVID-19 in hospital settings (2022, May 17) retrieved 2 July 2022 from https://medicalxpress.com/news/2022-05-desktop-air-curtain-covid-hospital.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.
58 shares

Feedback to editors