131–140 of 163 posts
Great idea. What's worked for me is simply taking a 20"x20"x1" filter and sliding it into the back cover of a standard $25 Lasko box fan. Cheap, easy option for air filtration in the home.
https://www.youtube.com/channel/UC3_AWXcf2K3l9ILVuQe-XwQ/vid...
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That’s a great idea. What kind of filter do you use?
Some really good discussion of this has happened on HN last time California was on fire.
1. https://www.predictiveservices.nifc.gov/outlooks/monthly_sea...
I don't know if that's really true. Looking at the top 20 or so Air Purifiers on Amazon, almost none of them mention the CADR or flow in the title, and very few of the reviews mention it. Most talk about sound, "HEPA", "ozone-free" etc.
My guess would be that people care much more about physical appearance than maximum flow. I would personally not tape an octagon of dirty air filters to my ceiling because that would be look ridiculous and probably not filter as well as my beautiful, silent $200 Winix box.
Great idea. What's worked for me is simply taking a 20"x20"x1" filter and sliding it into the back cover of a standard $25 Lasko box fan. Cheap, easy option for air filtration in the home.
Tends to burn out the motor though. Vornado used to sell an air filter that took two 10x20” house filters. Before I discovered that model I was trying to build my own using computer case fans (my intent was to hide the loud box under furniture). Home Depot used to carry those in the 1500 classification which was great, but those are getting harder to come by too, and even the regional chain that had them doesn’t as m…
https://www.epa.gov/indoor-air-quality-iaq/should-you-have-a...
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That’s a great idea. What kind of filter do you use?
Is that enough for allergens, smoke, and pet dander? I don't care about virus filtration (which is not going to happen anyway, if it's something I'm making out of cardboard and duct-tape)
You're trying to reduce the viral load in the air, not build a BSL4 lab.
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> Tends to burn out the motor though. Do you have data on this? Adding a fan shroud to the Corsi-R supposedly does not increase energy usage or motor temperature: https://www.texairfilters.com/how-to-improve-the-efficiency-... I'm looking for data on the power usage and motor temperature difference from a 20" Hurricane in normal operation, with a 20" merv 14 on the back, a C-R and a Comparetto.
Same author https://www.texairfilters.com/a-variation-on-the-box-fan-wit... chose 4 filters due to higher throughput. He has an addendum at the bottom where they tested the fans and saw no problems with a single filter. I... don't understand how they come to those conclusions based on the charts in the paper. All of the fans were >10ºC hotter and one model went up by 20. 15C is a lot for cheap, planned obsolescence c…
Consider that they are designed for cooling in a window application, which means they must be able to survive operation 35C in direct sunlight. As an air filter, mine operates at 22C in shade. That easily makes up for the temperature differential due to load conditions.
"people often select purifiers based on their maximum flow" I don't know if that's really true. Looking at the top 20 or so Air Purifiers on Amazon, almost none of them mention the CADR or flow in the title, and very few of the reviews mention it. Most talk about sound, "HEPA", "ozone-free" etc. My guess would be that people care much more about physical appearance than maximum flow. I would personally not tape an oc…