EE inventor avoiding COVID, cleaning the air DIY, cheaper/better. Iāve got a few US/International patents. ex @CRBoxKits, search 4 old posts. Still novid āØ
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Actual fire hoses are 1ā-5ā and need special plumbing. 
This is the HEPA filter. Itās $9 but gotta buy 2 for $18. Itās exactly the size of the 120mm fan. All we are going to do is tape it in place. Everything else you need is in the quoted thread in the OP
The cheapest 4ā filter. Itās $25. AC Infinity makes a $50 version thatās much sexier but this build is for best bang for buck
First of all, forget electricity. Plug-in 120v electric heaters top out at 5000 BTUs of heat. Patio heaters running on gas put out 10x or 50,000 btus. For heating the outdoors w friends you want as many btus as you can get. Itās gotta be gas.
To start: all humidifiers are fairly high maintenance. They need to be filled and cleaned every few days. There is no way to avoid that. But itās worth it for the best indoor air. If you have HEPA and carbon already in place itās the finishing touch. Helps fight COVID too.
So first off, the grow carbon filters are about $4/lb of activated carbon, cheapest deal. They can be all black n fairly sleek. For tackling smells for years nothing beats em. Years. This brand is great; all work. 8ā has about 22lbs carbon inside for $89
With the discount code itās $210 for the machine; tests are $7/each for Covid, $14 for COVID/FLUA/B. They also have MPX tests, $9. It runs off a USB battery, super portable. I tested more than 20 ppl in batches at the memorial. Absolutely changed our relationship w indoor parties
Itās all leftover pro grow gear n so this would be stupidly expensive for home use, but I had this stuff so here it is. It has a digital controlled electronically commutated motor, high cfm/pressure with lowest noise possible. Great under pressure, CADR should be high % of 710cfm
Hereās the Micro Core. Fan, filter, usb fan adapter, usb plug. Legs are random bits I had, and optional. 
Itās a great filter. Itās open on both sides, so find a flat surface to put it down onto upside down, then drop any 140mm fan on top. The filter comes w foam surrounds that make a seal w table and fan. Plug into USB (or 120) and voila! I am going to be sharing a few versions. 
4. We have a guest room w separate entrance/air. When he was in shared space, windows/doors open, AC fan on (Merv13), range hood on low, bathroom fans on n distanced. PC fan CRBs in each room
Itās twice as big volume wise as the 120mm fan white fandelier. Sound is the same, but CADR is more than double. With all the carbon options this filter has, it will be able to clear COVID, diesel particulate and VOCs/fumes as well, just gotta choose the right filter. Pretty cool
The default Netatmo app is adequate but the interface is too simple for serious ppl. Itās designed for broad user base of course. You can get detailed co2 history but itās a little bit of a pain. Nevertheless all the data is there. But thereās a better wayā¦ 
Itās not a great sentence. āDirectly towards each otherā implies opposition, yet why would anyone do that, prob just bad writing. āReduced aero-acoustical performanceā is very vague, and possibly only about sound level. @DavidElfstrom is there a better resource for this info?