Share this page!

Enter URL or ID to Unroll

You can paste full URL like: https://x.com/threadreaderapp/status/1644127596119195649
or just the ID like: 1644127596119195649

How to get URL link on X (Twitter) App

  1. On the Twitter thread, click on or icon on the bottom
  2. Click again on or Share Via icon
  3. Click on Copy Link to Tweet
  4. Paste it above and click "Unroll Thread"!
  5. More info at Twitter Help
Jonathan Fertig Profile picture
Jonathan Fertig
@rightlegpegged
Architect | Physicist | Cities for People, Bicycles for Transportation | Founder @StreetsPAC_MASS | Tactical Urbanist #DemandMore
Apr 4, 2020 • 16 tweets • 9 min read
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 Warning: if you go looking for a MERV 13 filter you'll be out of luck at HD. That's b/c they use their own (non-ASHRAE) standard: FPR.
So what to do?
According to what I found online, FPR10 filters (the highest they sell) is equivalent to MERV 13.
Instructions should include this