So! Been a minute, but I finally compared a Johnston’s merv 8, a camfil ap3 (a better filter), and a camfil 30/30. In my 100% scientific test where I held them at the same level and dropped them the 30/30 always landed before the others. Here I attempted to use a manometer. All raw, and unedited. More vids in comments

Posted by Deleted (8831e793) at 2021-04-21 21:41:35 UTC