J Hosp Infect. 2023 Jan:131:54-57: Portable HEPA filtration successfully augments natural-ventilation-mediated airborne particle clearance in a legacy design hospital ward.   

Br Dent J. 2010 Oct 23;209(8): A pilot study of bioaerosol reduction using an air cleaning system during dental procedures

NHS England: NHS Estates Technical Bulletin (NETB 2023/01A).  

Association for Aerosol Research: GAeF position paper paper on understanding the role of aerosol particles in SARS-CoV-2 infection.

Indoor Air. 2013 Jun;23(3): Pilot study of high-performance air filtration for classroom applications.  

Am J Infect Control. 2010 May: The impact of portable high-efficiency particulate air filters on the incidence of invasive aspergillosis in a large acute tertiary-care hospital.