Currently researching Corsi-Rosenthal boxes, comparing design styles.
Does anyone know of any reason the designs using only 2 filters should be avoided? Are there any problems or reduced area of effect?
#COVID_19
#covid
@Cutename nope! Some really good ones using 2 filters lately. But filters can be all sizes – both length/width and thickness – wanna have as much filtration area as you can in the footprint you want.
@trendless We're trying to build as many as we can on a limited budget. We're looking to protect a lot of people for just a few days. Any recommendations are greatly welcome. It's about 80k sq ft of assorted hotel function space total.
@Cutename can you take your time to find the best, cheapest stuff or is there a tight deadline?
@trendless Definitely on a timeline. We may have a resource for wholesale.
I've been eyeballing the two filter style, forming a triangle base for stability and safety.
@Cutename I'd be tempted to look at single 5" filter units. Perhaps the quickest to assemble and mayyyybe competitive on price. Should have similar throughput to 4x1" filter cubes. Triangle is maybe good too, especially if 2x2" filters. Definitely get good, vetted filters tho; some real stinkers out there. Apologies if any of this is stuff you already know.
@trendless The deal is we have a bunch of box fans and a next to nothing budget. 4 + filter designs are going to leave us with more spaces without. I'm trying to find our best compromise. It's not a fun place to be.
@Cutename @trendless
Air filtration is important
https://www.texairfilters.com/a-mini-corsi-rosenthal-box-air-cleaner/
but so too is ventilation & air circulation. Maybe have a few fans at 90° angles with windows & doors open.
https://twitter.com/DrEricDing/status/1446551634469924866?t=fjp1j06ys2KjtPELoijIFQ&s=09
Alternative cheap option
https://www.mpg.de/16075350/1127-chem-ventilation-made-easy-152990
A Mini Corsi/Rosenthal Box Air Cleaner - Tex-Air Filters

By Jim Rosenthal Many people have asked for a smaller version of the Corsi/Rosenthal Box Air Cleaner. In the spirit of the “open source” cooperative approach there have been several versions pictured on Twitter. These excellent examples inspired me to build one myself. Here is the result – a Mini-Corsi/Rosenthal Box! The fan is a ... More

Tex-Air Filters
@paul_briley @trendless It's an event in a hotel. We've got nothing to open and a MERV 8 ventilation system. We're very limited on budget.
We are limiting numbers in rooms, requiring masks and current vaccines, allowing for distancing, and doing CO2 monitoring.
The CR boxes are our best option.

@Cutename @trendless
If there're tables then mini #corsirosenthalbox per table might be better.
https://www.washingtonpost.com/health/interactive/2021/indoor-air-quality-safety-experiment/

Also Iota-Carrageenan nasal spray reduces viral load. Could be offered to participants.
https://www.sciencedirect.com/science/article/pii/S2405580821002818
Swirling CPC mouthwash like Colgate Phlax afterwards for several days in afternoon should kill any covid in mouth.
https://youtu.be/As4bOxloC9c

Just thinking outside box in other ways to reduce risk.

A California restaurant’s experiment amid coronavirus to improve indoor air quality and safety

Sierra Mar, a resort restaurant in Big Sur, Calif., has added new technology to reduce possible transmission of coronavirus and other of airborne pathogens.

The Washington Post
@paul_briley @trendless Very interesting. I'm not sure how much we'll be able to utilize, but please do keep the ideas coming. If I can make something happen, I will.
We can't offer sprays or mouthwash due to far too many allergy and legal concerns, never mind no budget for it. We're a volunteer run .org. Dispensing such things raises its own list of materials and people points. Just so you see what I'm up against here. It's a tough job.

@Cutename @trendless
I definitely wouldn't want to be trying to organise such as event now indoors.

Instead of offering these pharma items, maybe suggest for those keen to take extra precautions. Ppl can be so sensitive & fragile though for well meaning efforts.

Info & education does make some difference 4 some ppl.

@paul_briley @trendless We're requiring surgical masks minimum, and current vax, distancing, using CR boxes, and CO2 monitoring. sanitizer, separate food areas, prioritizing our highest risk areas, and having anyone showing symptoms leave the event - regardless of test results. We're about to call in a mitigation expert just to see what they say. It should be interesting. I've been so busy. No end in sight.
@Cutename @trendless
Surgical masks aren't good enough. FFP2 or N95 should be minimum. Surgical masks have gaps so are useless for aerosolised viral particles.
https://covidactiongroup.net/mask-fit-matters
Mask Fit Matters — Covid Action Group

Covid Action Group
@paul_briley @trendless Unfortunately, the event doesn't feel they can require N95s as they are unable to provide them. We have a fair amount of low income attendees. We're an educational event. No one profits whatsoever. Volunteer run entirely. Unless some magic N95 fairy gifts us with a few thousand masks, it's the best I could get. We aren't allowing any nose dangling, or improper wearing, under threat of being kicked out.
@Cutename @trendless
There are some Far-UVC firms trying to promote their sanitation lighting & may install for free to prove effectiveness.
https://rzero.com/vive/
Vive | Far-UV Air & Surface Disinfection System | R-Zero

Vive is an autonomous and continuous air & surface disinfection system for occupied spaces that uses the safe and effective power of far-UV. Learn more here.

R-Zero
@paul_briley @trendless That looks interesting. The hotel is going to have to ok that. I'm thinking they're not likely to want to promote a product, or allow anyone but their contractor to handle the electric. They're a corporate giant. We have to pay for all electric besides convenience outlets. Of course that bill is inflated greatly.
I don't mean to rain on your parade. I'm up against two corporate entities. The CR boxes were a big win.
@Cutename @trendless
Found this. Might be useful persuasion
https://www.hotelinnovationexpo.co.uk//news/blog.asp?blog_id=38471
And this from an ABC news article online
"In addition to the Beverly Hilton, the InterContinental Hotels Group, which includes hotel brands Holiday Inn and Candlewood Suites, told ABC News they are now using UV light sanitizing technology in some of their hotels, including at the Crowne Plaza Hotel in White Plains, New York."
Hotel & Resort Innovation Expo

The Hotel & Resort Innovation Expo, 10th & 11 October 2023 exists to revolutionize the Hotel industry.

Hotel & Resort Innovation Expo
@paul_briley @trendless I may try informally asking our hotel liaison what he thinks of this. Given we're less than 2 months from the event, it's likely a maybe next year topic. I'm still waiting for the hotel to give us a simple yes / no answer on something we only require approval from them - no effort or expense involved, and it's not even an unusual request. It's been over 3 weeks.
Got anything faster to implement? Cheap is good too.
Ventilation made easy

A simple ventilation system removes 90% of respiratory aerosols which potentially include coronavirus particles, from indoor air.

@paul_briley @trendless Anything that has to be installed into the hotel structure is not likely to happen. If we can bring it ourselves, use it, and take it with us, it's way more of a possibility. Hotel gets complicated because of industry contracts. Convention centers are even worse. We're not big enough to have sway, or pay thousands in contractor fees. We can't even use the wrong tape.