We've created this guide on how to protect yourself from an airborne virus using HEPA filters in offices and schools. A simple solution that needs to be used especially in the fall/winter when opening windows and doors will be less practical:
docs.google.com/document/d/17t…
CO2 monitors are an important component to this, and can roughly tell you how much of the air is fresh in a given room. Higher than 700 is risky, and the higher the number, the more you get 'rebreathed' air from another person possibly containing infectious virus.
The goal is to get to 6 ACH (air changes an hour), which is the minimum in most hospital settings. We describe how to calculate this, and what types of filters you should be buying.
It doesn't need to be complicated, even improvised devices with a fan, duct tape and some furnace filters will do a great job.
Thanks to @DavidElfstrom for his tremendous expertise and the rest of the #masks4canada team for helping put this together!
This dovetails to our recent letter to the Ontario Premier; making classrooms safe from a ventilation perspective is extremely simple. And costs less than $25 per student. Getting this ready by September should be the top goal now.
An example where hepa filters can help considerably. Imagine drinking at a water fountain where 8% of the water is backwash from other people!
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