Saiosh Webinar - 7 September 2020, 11h00

Ventilation as a Key COVID-19 Barrier

Indoor ventilation is an important consideration regarding viral transmission; correctly applied it can reduce spread. Conversely, poor ventilation promotes viral transmission. The odds of transmission in a Japanese study show that COVID-19 spread was 18-fold higher in an enclosed environment than in an outdoor environment.


Neels Nortjé

Founder Member and CEO

South African Institute of Occupational Safety and Health (Saiosh)

Neels Nortjé is a founder member and CEO of the South African Institute of Occupational Safety and Health (Saiosh). He started his working career with ESKOM in 1981 where he qualified as an Architectural Draughtsman. 

In 1986 he changed his focus to Safety Risk Management and qualified with ESKOM as an Occupational Health and Safety Risk Management Officer. He holds a N6 Mechanical and Electrical Engineering qualification as well as a National Diploma in Safety Management. He has been practicing Occupational Health and Safety for more than 30 years. 

He was appointed by the Minister of Labour to serve on the Minister’s Advisory Council for Occupational Health and Safety (ACOHS). He is a Chartered Member of Saiosh (CMSaiosh) and a Chartered Member of IOSH (CMIOSH)

Dr Greg Kew

Occupational Medicine Specialist

Dr Greg Kew holds the following registrations and affiliations: Registered Occupational Medicine Specialist, Health Professions Council of South Africa. Associate member of the College of Public Health Medicine (Division of Occupational Health). 

South African Society of Occupational Medicine: Executive Committee Member. Honorary Senior Lecturer, Department of Occupational Health, Faculty of Health Sciences, UCT Medical School. South African Medical Association: Member. 

His education and qualifications include: Medical Doctor (MB.ChB. – University of Cape Town 1986). Awarded with honours, and the Final Professional examination was passed with distinction. Post Grad Training: Occupational Medicine (Post Graduate Diploma, UCT, 1992) Anaesthesia (Post Grad Diploma, College of Medicine, SA, 1989), Greg’s areas of special interest are: Occupational Health Management Systems and Information Technology (design, implementation, analysis). 

Occupational Health related law. Auditing and corporate consulting. Training and development of Occupational Health professionals. Management of Workplace Absenteeism, Incapacity & Disability. Chemicals in the Workplace (Health Risk Assessment, toxicology, surveillance

Garth Hunter

Industrial Hygiene Specialist


Garth Hunter is the Industrial Hygiene Specialist at Engen. He holds a Master of Medical Science (MSc) and is a registered Occupational Hygienist (SAIOH) as well as a registered Chartered Member (Saiosh). 

Garth also serves as a Department of Employment and Labour Government Specialist on TC 7. He is a board member of the International Occupational Hygiene Association (IOHA) as well as a KZN Occupational Health COVID-19 Task Team member.

Sean Chester

Technical Director

Apex Environmental

Sean Chester. Sean has a Master’s Degree in Occupational Hygiene (Wits), he is a Registered Occupational Hygienist with SAIOH, Senior Assessor for the SAIOH Professional Certification Committee (PCC), Ex Chair of the SAIOH PCC (2019 / 2020), Honorary Lecturer at the Discipline of Occupational and Environmental Health at UKZN, Technical Director at Apex Environmental (Approved Inspection Authority, Saiosh Corporate Member; Member of the Durban Chamber of Commerce and Industry),  In the COVID-19 pandemic response movement, Sean serves as an advisor on both the National and Provincial Occupational Health Task Teams. Sean has an limitless curiosity for anything to do with toxicology, microbiology and physiology and his life-long passion for teaching is demonstrated in the many lectures and conferences he has spoken in and committees he has served on.