I Made a Quieter Air Purifier
6 comments
·November 24, 2025calvinmorrison
Corsi-Rosenthal... they taped some filters to a fan, something the poor folk have been doing forever and academia acts like they invented fire. It's caveman technology with a fancy name.
embarassing
runariot
Why do computer fans blow air inside?
chr-s
You want to suck air through the filters rather than blow into them. For one, this keeps the fans cleaner but also it's more efficient, reducing turbulence inside the box.
https://old.reddit.com/r/crboxes/ is a good resource if you're looking to make your own. There's been a general shift from large box fans to PC fans because their performance/noise ratio is better.
pixl97
Your question isn't very clear... Is it why do they use computer fans? (My guess is that is what they had). Or is it why do you blow instead of suck?
brtv
I think this done to create a slight overpressure which helps keep the dust out.
I had the same insight for in-home air movement. Purpose built inter-room fans from broan/etc are 3x louder and several times more expensive than computer fans at the same CFM. I've been very happy with them.
https://scosman.net/blog/using_in_wall_computer_fans_for_hom...