Shroud measurements

Suggestion from alhu on Aug. 16, 2021, 3:15 p.m.

Update page to include changes to shroud measurement, image for measuring internal diameter and updated figure notations

Changes in this suggestion:

Comment from philipn on Aug. 16, 2021, 5:48 p.m.

Thank you, accepted!!

I wonder what a good "lower bound" for the CADR for smoke-sized particles and COVID-sized particles would be with a 'typical' box fan + cube setup. I have my own estimates and I know David Elfstrom is performing some tests of the full cube soon.

If we have this rough lower bound then we can tell people to e.g. check out the (COVID-oriented) portable air calculator spreadsheet from Harvard/CU Boulder.