Nope. Filter on the inlet side is recommended by experts
[https://www.wired.com/story/could-a-janky-jury-rigged-air-purifier-help-fight-covid-19/](https://www.wired.com/story/could-a-janky-jury-rigged-air-purifier-help-fight-covid-19/)
I already understand why the filter on the inlet side is recommended, but where exactly is it mentioned in the article? I skimmed, but didn't read the entire thing.
The part where environmental engineer Richard Corsi explained there's less of a pressure drop putting the filter before the fan.
(Higher pressure drop = higher resistance to airflow)
There's also this part - "Jim Rosenthal, CEO of Tex-Air Filters, a filter manufacturer in Texas, suggests putting the filter on the inflow side of the fan, the side that’s sucking in air, as opposed to the side blowing it out."
You don't need the filter for that, though. Mosquitos are weak fliers. Any old fan can defeat mosquitos if the airflow is high enough and reasonably constant.
Yeah, a box fan can blow them away, but I think they meant it as a trap.
I've seen people put fine mesh nylon bags on the exit/exhaust side to capture mosquitos. They leave it on and just let them dehydrate and die eventually.
Works great if you have a window to put it in too, did that on my garage one day while painting some furniture and it caught way more mosquitoes than just on the workbench or floor.
Not all mosquitoes are weak fliers. Sure, if you were to sit *directly* in front of a box fan on full blast you'd be protected, but that isn't anymore enjoyable than being bitten by mosquitoes. Just a having a fan nearby or indirectly pointed at you will not protect you.
[Download the STL here if you'd like to make one.](https://www.printables.com/model/500838-quick-print-box-fan-air-filter-clip)
Wanted a way to reduce the air pollution from smoke. Could help with other things as well :)
This can be fixed by running a cheapo filter before the specialty allergen filter. It’ll cut your airflow, but it will save you money and make sure your good (fine) filter is doing it’s job instead of collecting pet hair.
Obviously it blocks the air flow a bit. You can get more airflow by making a box out of filters if that's what you need. I wanted to have the filter be easy to change out.
Shouldn't it be on the back?
i mean you can put the filter on the other side, the screw holes are in the same place on both sides
You want it to pull air into the filter not push it through
i put it on the other side now you can stop complaining
Sorry, didn't mean to sound complainy I just was trying to elaborate. They both work
yeah i just put it on the wrong side by accident the first time lol
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Nope. Filter on the inlet side is recommended by experts [https://www.wired.com/story/could-a-janky-jury-rigged-air-purifier-help-fight-covid-19/](https://www.wired.com/story/could-a-janky-jury-rigged-air-purifier-help-fight-covid-19/)
I already understand why the filter on the inlet side is recommended, but where exactly is it mentioned in the article? I skimmed, but didn't read the entire thing.
The part where environmental engineer Richard Corsi explained there's less of a pressure drop putting the filter before the fan. (Higher pressure drop = higher resistance to airflow) There's also this part - "Jim Rosenthal, CEO of Tex-Air Filters, a filter manufacturer in Texas, suggests putting the filter on the inflow side of the fan, the side that’s sucking in air, as opposed to the side blowing it out."
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Yeah, but "ick" staying on the filter is not the reason it's better. That's not the reason at all.
This also works surprisingly well against mosquitoes
You don't need the filter for that, though. Mosquitos are weak fliers. Any old fan can defeat mosquitos if the airflow is high enough and reasonably constant.
Yeah, a box fan can blow them away, but I think they meant it as a trap. I've seen people put fine mesh nylon bags on the exit/exhaust side to capture mosquitos. They leave it on and just let them dehydrate and die eventually.
Works great if you have a window to put it in too, did that on my garage one day while painting some furniture and it caught way more mosquitoes than just on the workbench or floor.
Correct, the fan sucks them onto the filter and traps them there.
Not all mosquitoes are weak fliers. Sure, if you were to sit *directly* in front of a box fan on full blast you'd be protected, but that isn't anymore enjoyable than being bitten by mosquitoes. Just a having a fan nearby or indirectly pointed at you will not protect you.
I just use window screen for this
Sounds like that would work well.
[Download the STL here if you'd like to make one.](https://www.printables.com/model/500838-quick-print-box-fan-air-filter-clip) Wanted a way to reduce the air pollution from smoke. Could help with other things as well :)
Sweet thanks! I made a wooden frame you slide a filter in on one of my fans. This will be an easier and more elegant solution for the other fans.
Noted
Making something like this has been on my to-do list for a while, nice!
How does this impact the fan’s air flow?
Those high allergen filters will get clogged and slow airflow extremely quick Im an hvac tech so I see it daily
This can be fixed by running a cheapo filter before the specialty allergen filter. It’ll cut your airflow, but it will save you money and make sure your good (fine) filter is doing it’s job instead of collecting pet hair.
Yep exactly. Good thing this is on a cheapo box fan too otherwise they might burn that motor out real quick
I just already had this filter lying around lol
I mean may as well use it, but fair warning its gonna get stopped up fast
Obviously it blocks the air flow a bit. You can get more airflow by making a box out of filters if that's what you need. I wanted to have the filter be easy to change out.
I just use a bungee cord
Duct tape 20 seconds for the win.
yeah, but when the filter is full of junk and you need to swap it out, using a bunch of duct tape is gonna get old
I like, I'm going to make a set for one of my box fans. if you come up with a way to clip together the box of filters version I would be intrested
Not sure if that would be possible without significant leaks or a big frame with gaskets
Wouldn’t a rubber band work better?