Directional airflow and ventilation in hospitals: A case study of secondary airborne infection

Ehsan S. Mousavi, Kevin R. Grosskopf

Research output: Contribution to journalConference articlepeer-review

8 Scopus citations


Since the 1990s, improvements in ventilation techniques and isolation procedures have been widely credited with the decline in nosocomial transmission of tuberculosis and other airborne diseases. Little effort, however, has been made to study the risk of isolation patients acquiring secondary infections from contaminated air migrating into negatively pressurized isolation rooms from adjacent spaces. As a result, an actual hospital was used to observe the transport of aerosol from a nursing station and general patient room to a nearby airborne infectious isolation room (AIIR). Aerosols ≤3.0μm (viruses and most airborne bacteria) were found to be capable of migrating 14.5m from a general patient room to an AIIR anteroom entrance in <14 minutes at concentrations 2-5 times greater than ambient (e.g. background). Concentrations of aerosols within the anteroom and isolation room, however, remained virtually unchanged from ambient levels, indicating the effectiveness of door position and (or) ventilation. In contrast, gravitational settling and surface deposition appeared to limit the migration of aerosols >3.0μm to the entrance of the general patient room (4.5m).

Original languageEnglish (US)
Pages (from-to)1201-1206
Number of pages6
JournalEnergy Procedia
StatePublished - Nov 1 2015
Externally publishedYes
Event6th International Building Physics Conference, IBPC 2015 - Torino, Italy
Duration: Jun 14 2015Jun 17 2015


  • Airborne infection isolation rooms
  • CFD modeling
  • Secondary infection

ASJC Scopus subject areas

  • General Energy


Dive into the research topics of 'Directional airflow and ventilation in hospitals: A case study of secondary airborne infection'. Together they form a unique fingerprint.

Cite this