4 Filter Mask

Summary / Notes

Disclaimer:
• There are no guarantees about the efficacy of any home made masks. Use at your own risk. Get creative, stay safe. These are okay to use per CDC ONLY if you run out of other approved masks. Though the goal is to reach and exceed n95 level of filtration, this has not yet been confirmed. These are a last resort mask, considered equivalent to a scarf. You have to be the one to choose what you wear and I am not responsible for any negative outcomes if you choose to use this. The info here is for educational use only.


This is a large a cloogey mask. I designed it taking account of the following considerations:
• You can get reusable 3M respirators that work with the filters I mention under the “required” list below, but they only allow 2 filters. I wanted to have 4 to allow easier inhalation.
• In California, you are not allowed to have an exhalation valve in places like stores, etc. (an understandable attempt to slow the spread) so again, because t