The most useful invention I've ever run across... Corsi-Rosenthal box.
I have used this so far for:
Wildfire smoke
COVID-19
Bacon smoke (on Saturdays, LOL)
General improvement of AQI
Pet related allergies (hay and dander)
Ragweed/pollen heavy days
Dust from Santa Ana winds
Dust from construction/remodeling
Paint fumes (only partially useful, doesn't absorb gases, but helps somewhat) -- plus it sucks all the dust from the air, so it doesn't stick to your paint
I use 2" painters. Cheaper in bulk, unless you are using really crappy duct/duck tape.
Bonus: when time to change filters - peels off cleanly.
--
I know that I will always have at least 1 unit now... so I've been musing about how to set up something without using the tape... say a framework to put the filters into - that supports the fan and maintains a seal.
Someway to make it look like furniture would be kind of cool.
@JohnJBurnsIII@ai6yr Great idea about the tape. And what about a frame made from 2” corner molding, at least for the sides. Not sure about the top but use something to make a tray the fan could sit on. Now I’m looking at my wood scraps…
@suuuuconk@JohnJBurnsIII Mine either ended up being painter's tape or packing tape. We usually have a lot of packing tape around, and it's fairly easy to disassemble with a pocketknife.
@ai6yr
Yes. My mother had had a heart attack, was recovering at home, but kept telling caretakers to open the windows. 🔥 💨
She hated stifling still air, and was under medication where she could not understand why we couldn't open windows or turn on the heat-exchange.
I turned her box fan into a Corsi-Rosenthal filter, and everybody lived.
@ai6yr I used mine when I decided to try using the self-cleaning function on the "new" stove that had been sitting in my landlord's garage for an unknown amount of time.
@ClimateJenny@kateiacy@swart Great to know! The local big box stores here sell MERV13 equivalents cheap in bulk, and for awhile they were clearing them out (should have purchased more.... back when the "pandemic was over" but not really in 2021 -- got four 3M MERV13 for only $8 each)
@swart The lead based solder is a lot easier to deal with, I agree. The non-leaded stuff drives me crazy, but that's probably because I don't have the technique down or the right flux....
@ai6yr@swart S'funny, having literally always used lead-free, I find the leaded solder kind of annoying.
(In part because of the inconsistency with more modern soldiers, but also in part because I have to fire up my filter kit and work close to it. As a solder it's fine I guess, but not better.)
@ai6yr We've built and used them in the spaces we rent for tai chi classes. Have to renew the filters each year when we come back inside in the fall. The new normal....
@colo_lee They are wonderful. Wouldn't be necessary with better air exchange rates in buildings, which SOME folks were working on -- but unclear and non-obvious to me what buildings are and aren't up to spec.
@ai6yr Endless irony in this being hosted on UC Davis' site and part-invented by a UC Davis prof/admin...given how UC Davis has handled this ongoing pandemic. #UCAccessNow
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