Jeffrey Siegel (@IAQinGWN) profile picture

Jeffrey Siegel

@IAQinGWN

Turning ideas into meetings

Joined December 2013
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Photo by Jeffrey Siegel (@IAQinGWN)Photo by Jeffrey Siegel (@IAQinGWN)Photo by Jeffrey Siegel (@IAQinGWN)Photo by Jeffrey Siegel (@IAQinGWN)Photo by Jeffrey Siegel (@IAQinGWN)Photo by Jeffrey Siegel (@IAQinGWN)Photo by Jeffrey Siegel (@IAQinGWN)
With safety top of mind as K-12 students go #backtoschool, #UofTEngineering professor and air filtration expert Jeffrey Siegel (@civmin) says investing in cleaner indoor air is key to reducing the spread of #COVID19 in the classroom 🍃💨 : uofteng.ca/airfiltration

Air filtration and COVID-19

Indoor air quality expert explains how to keep you and your building safe

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1/ There have been lots of questions about filtration and SARS-CoV-2. To understand how effective a filter is going to be, you need to know two things: the size distribution of the particles/droplets that contain the virus and the installed efficiency of the filter.
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15/ What should we do #4 Maintain your filter. You can change it based on manufacturers recommendations, pressure drop measurements, or on a schedule. Just make sure that you are changing it (carefully, to avoid exposure while changing).
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16/ Perhaps most importantly, a filter is not a substitute for other measures. Mask wearing, physical distancing, considering ventilation and air flow, surface cleaning, managing people flows in the space, and local air cleaning and ventilation are all important.
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1/ We are focussed on ventilation quantity to reduce risk of COVID-19 and that is not all that matters.
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7/ Practical advice: Ventilate well, but carefully. Go to Andy and Lisa's webinar tomorrow isiaq.org/docs/COVID-19_Pers…
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8/ I should have added 2 things. Ventilation cross contamination (exhaust air getting reentrained) and mixing causing increased indoor dispersion are other potential ventilation issues to consider.
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