I added a personal touch on the inside.
I've got a stack of these name tags that my mother used to sew into my clothes before I went to summer camp.
#coloradomaskproject

Tada!
Now the goal is to use these as infrequently as possible, b/c what we all need to be doing is staying home as much as possible.
#coloradomaskproject
#DoingMyPartCO

Now these pipe cleaner replacements get sewn into the top flap for a nose clamp thing. I think these will hold up better in the washing machine than a pipe cleaner anyways.
#Matchymatch
#coloradomaskproject

I've never sewn pleats before, so these came out kind of ragged.
Maybe I'll just say it was part of a punk aesthetic I was going for...
#coloradomaskproject

Taking shape.
#coloradomaskproject

1/4" hems on both short sides.
I'm using the same red thread for both masks b/c I only have one bobbin and I'm lazy.
#ColoradoMaskProject

Ready to sew (finally).
#coloradomaskproject

If you want to understand why MERV13/FPR10 is important, check out this chart.
You need this level to filter viruses.
#ColoradoMaskProject

That is not fun. This took 45 minutes and I wound up just cutting off the sides of the filter to release the fabric b/c there's so much adhesive on the long edges. Another reason to get a big filter: count on sacrificing some of it.
The hassle is worth it.
#coloradomaskproject

You're going to want a box cutter or some other long blade to separate the filter fabric from the cardboard frame. It sticks to the adhesive on the inside to hold it in place, so this step is proving to be more of a pain than I anticipated.
#ColoradoMaskProject

I just went to Home Depot to buy a MERV 13 HVAC filter for a homemade mask per the #ColoradoMaskProject instructions. I wore a bandana b/c, well, my mask isn't made yet.
Roughly 1/2 of the ppl in there (including lots of employees) had their face uncovered.
cc @GovofCO