Experimental evaluation of respiratory droplet spread to rooms connected by a central ventilation system. (19th January 2022)

• Record Type: Journal Article
• Authors: Vlachokostas, Alex; Burns, Carolyn A.; Salsbury, Timothy I.; Daniel, Richard C.; James, Daniel P.; Flaherty, Julia E.; Wang, Na; Underhill, Ronald M.; Kulkarni, Gourihar; Pease, Leonard F.
• Is Part Of: Indoor air. Volume 32:Number 1(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-01-19
• Subjects: COVID‐19 -- indoor air quality -- influenza -- mucus -- viral fate and transport; Indoor air pollution -- Periodicals; Sick building syndrome -- Periodicals; Ventilation -- Periodicals; 613.5
• DOI: 10.1111/ina.12940
• Languages: English
• ISSNs: 0905-6947

Abstract

Abstract: This article presents results from an experimental study to ascertain the transmissibility of the SARS‐CoV‐2 virus between rooms in a building that are connected by a central ventilation system. Respiratory droplet surrogates made of mucus and virus mimics were released in one room in a test building, and measurements of concentration levels were made in other rooms connected via the ventilation system. The paper presents experimental results for different ventilation system configurations, including ventilation rate, filtration level (up to MERV‐13), and fractional outdoor air intake. The most important finding is that respiratory droplets can and do transit through central ventilation systems, suggesting a mechanism for viral transmission (and COVID‐19 specifically) within the built environment in reasonable agreement with well‐mixed models. We also find the deposition of small droplets (0.5–4 μm) on room walls to be negligibly small.