Post #3569870
2026-07-04 01:49 UTC
Just to piggyback off this comment a bit (since I’m not sure I’ve ever rented anywhere with MERV 13+ filters). Try making a Corsi–Rosenthal Box with a box fan and 4 air filters. This might be beyond your price range since MERV13 filters aren’t the cheapest in the world when you have to buy 4 of them, but I’ve been using mine for years and they work REALLY well. My PM2.5 sensor is consistently on “0” unless I’m cooking.
Replies (1)
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@ProdigalFrog@slrpnk.net 2026-07-04 05:07
While Corsi boxes do work, I personally find that just using a single thicker 4" filter taped to the back of a fan works better, as it takes up a smaller footprint and allows you to direct the air flow at something other than the ceiling. The thicker filter is much, much less restrictive than a 1" filter due to the increased surface area. The thick ones cost about $28, and will last a very long time before needing to be replaced.