Box fan air filters work...
Pic #1: MERV 12, MPR 1500 @3M @Filtrete, at 8:30AM today. In use nonstop for 1 week, in SF, in a bedroom with doors/windows shut. Taped to a cheap box fan on medium setting (2).
Pic #2: the same filter, at 6:30PM today. Outside AQI was 200-230.
Pic #1: MERV 12, MPR 1500 @3M @Filtrete, at 8:30AM today. In use nonstop for 1 week, in SF, in a bedroom with doors/windows shut. Taped to a cheap box fan on medium setting (2).
Pic #2: the same filter, at 6:30PM today. Outside AQI was 200-230.
Per the @nytimes, 87% of smoke particulates are removed from a room within 35 minutes, with a box fan air filter on a medium setting. (In an unfair comparison to expensive purifiers being run on high....you can also run the box fan on high!)
nytimes.com/wirecutter/blo…
nytimes.com/wirecutter/blo…
Pro tips:
1. Seal all air gaps with either gaffer or duct tape (see pic)
2. The filter can go on either the front or back. Pick the side *farthest away* from the fan blade, to get the most air flow. If you like, go even farther by adding a cardboard box (picture a wind tunnel!)
1. Seal all air gaps with either gaffer or duct tape (see pic)
2. The filter can go on either the front or back. Pick the side *farthest away* from the fan blade, to get the most air flow. If you like, go even farther by adding a cardboard box (picture a wind tunnel!)
PS for all the stressed moms and dads out there...anyone who has parented a preschooler has the necessary over-taping skills to do this! 😆
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