3 ms·

I got a CR subscription to look at air filters. For good air filtering you really only need a hepa filter ($20) in front of a fan ($20), but CR only analyses th

I got a CR subscription to look at air filters. For good air filtering you really only need a hepa filter ($20) in front of a fan ($20), but CR only analyses the performance of brand name products ($200).

xapata 3y ago
Not exactly. To be comparable to the good air filter products, you'd want to build a cube of air filters and attach the fan so it pulls air through the cube. Fun DIY project, but it's not for everyone. There's a good YouTube video for it.
- alister 3y ago
  The DIY cube air filter even has its own Wikipedia entry: https://en.m.wikipedia.org/wiki/Corsi–Rosenthal_Box https://en.m.wikipedia.org/wiki/Corsi–Rosenthal_Box
az226 3y ago
Next time try your library. Many offer free access over the web.
NLips 3y ago
For best filtering, place the filter so air is “sucked” through by the fan, rather than “pushed”. (Quite possibly what you meant; I just found “in front of” easy to interpret in either way)
mrob 3y ago
HEPA filtration only matters if you have a clean side and a dirty side. Most air filters exhaust clean air into the same room as the intake, so all that matters is clean air delivery rate [0]. It's often possible to get better clean air delivery rate using higher flow through a less restrictive non-HEPA filter. [0] https://en.wikipedia.org/wiki/Clean_air_delivery_rate https://en.wikipedia.org/wiki/Clean_air_delivery_rate
- bsilvereagle 3y ago
  The removal efficiency of the filter is built in to CADR, so say a MERV-14 filter with higher air flow and a HEPA filter with lower air flow can have the same CADR. The Wikipedia article does not discuss the 2 (different!) methods of calculating CADR but this does: https://frdmtoplay.com/nagivating-air-purification/ https://frdmtoplay.com/nagivating-air-purification/