3M 6200 mask outlet vent surgical mask filter holder

thingiverse

For those using the 3M 6200 as a respirator, take note that the exit valve is not really filtered. Meaning, the mask does a very good job of protecting ourselves from outside contamination. However, to be a responsible user, in the outbreak of COVID-19, we need to think about protecting other people as well, as you may be walking around carrying the virus but is asymptomatic. This attachment allows a small squarish 44mm cutout of a standard surgical mask to be used as a filter for droplets you exhale. The design is made to fit the outlet vent after putting the filter in and retaining with the retainer clip. After some initial testing, I've kept about 5mm buffer space between the mask vent and the filter. This is to avoid the filter becoming a valve on its own and restrict exhalation, which could lead to shortness of breath and dizzyness. As for hygiene purposes, since this is and inward facing and catching your own droplets, if you do not have any symptoms, you could change the filter every other day or even a bit longer. I spray disinfectant on it (from the inside) when i get home and plan to use it for a few days. Coupled with Lucifer01's model for the surgical mask filter adapter, one can reuse a standard surgical mask at least between 6 to 10 times. https://www.thingiverse.com/thing:4147665 Stay Safe HK! And most importantly ensure you do not spread sickness as well while protecting yourself