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Joey Fox Profile picture
@joeyfox85
Jan 17, 2022 • 6 tweets • 3 min read • Read on X
THE MINI #corsirosenthalbox

Here it is:

1/6 Image
Fan from here:
(the one displayed on the wayfair website was not the one shipped. It's seen on the amazon website.)

2/6
wayfair.ca/home-improveme…

amazon.com/Comfort-Zone-P…

H/T @Flying_Donny
Filters from here:

3/6
amazon.ca/FilterBuy-10x1…
When to use:
- large CR box is a bit loud for sleeping, so these are better for bedrooms
- try to sneak these in to places where HEPA filters are banned. No one will have a clue what they are.

4/6
Because of the shape of the back of the fan, the cardboard needs to be put at the bottom and the filter opposite the fan.

The filters need to be assembled in a slightly different configuration. Try to fit them around and use duct tape to cover the gaps.

5/6 ImageImage
Admittedly, for small applications like a bedroom, a standard tiny HEPA filter from the store is sufficient and not too expensive. But if you are having a gathering, you can turn these up and get pretty good CADR for the cost.

@JimRosenthal4 @amandalhu

6/6

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More from @joeyfox85

Joey Fox Profile picture
Dec 14, 2023
The @NukitToBeSure Tempest

I was shipped this PC fan box and put it together. It looks really good. I think for many situations, this is the best option out there. Here are some thoughts about it.
1/11 Picture of the Tempest PC fan box.
I stated earlier on my blog: we need a PC fan air cleaner that is durable and looks good. While durability and looks are not the most important aspects of air cleaners, many companies want that. We now have it.
2/11 If a commercialized cleaner using PC fans similar to the aluminum fabricated PC fan CR box existed, it would provide an ideal solution for commercial spaces.
It took me about 1.5 hours to put together. It was a little more difficult than the @cleanairkits ones because Clean Air Kits uses plugs to snap the fans on instead of screws. This could be something adjusted in the future. 3/11 Image
Read 11 tweets
Joey Fox Profile picture
Oct 18, 2023
The blood libel is a deep scar from Jewish history. Jews were accused of slaughtering Christian children and baking their blood into the matzah we eat on Passover. It lead to pogroms against Jewish communities where many Jews were massacred.
We just witnessed a new blood libel created over the past day. Unverified claims by Hamas were promoted by MSF, the UN, politicians and many major media outlets.

We've seen the resurrection of all the classical antisemitism: pogroms, massacres, blood libels, death squads
This is a description of the Khmelnytsky massacres in Ukraine 1648–1649.

Nothing has changed. Rav Hanover describes the cruelty in great detail. He mentions the terrible killings which occurred in the towns of Pereyaslaw, Baryszowka, Piratyn, Boryspole, Lubin and Lachowce: These persons died cruel and bitter deaths. Some were skinned alive and their flesh was thrown to the dogs; some had their hands and limbs chopped off, and their bodies thrown on the highway only to be trampled by wagons and crushed by horses; some had wounds inflicted upon them and were thrown on the street to die a slow death… They slashed the bellies of pregnant women, removed their infants and tossed them in...
Read 4 tweets
Joey Fox Profile picture
Sep 20, 2023
I've updated my post on Intro to Far-UV.

Since I first published this post, there have been multiple experiments showing ozone is a concern when using far-UV and needs to be taken into consideration.

itsairborne.com/intro-to-far-u…
In the post, I discuss how initially we didn't think it was a concern. I think ASHRAE needs to update their guidance on different UV wavelengths. ozone section in the blog post
I have far-UV in my house. I think for personal residential use, it can be used in a limited way if you understand the risks with ozone and mitigate it with open windows when in use. That's how I use it. Image
Read 5 tweets
Joey Fox Profile picture
Jul 6, 2023
ASHRAE 241 Equivalent Clean Airflow Rates

Here are the equivalent clean airflow rates from the recent ASHRAE Standard 241 Control of Infectious Aerosols. I've calculated the equivalent air changes per hour and the equivalent CO2 (if all the clean air was outdoor air).
These rates are doubled when there is "vocalization above a conversational level" (e.g. singing)

I'll be hosting a space with the chair of the committee @WBahnfleth to discuss these rates and more. Please join and message for any questions you have.
twitter.com/i/spaces/1gqGv…
To determine the ACH and CO2, I had to make assumptions about density and metabolic rate. I used values from ASHRAE standard 62.1 or found the closest approximation. If densities are different, the equivalent ACH would be different. It doesn't affect flow/person or CO2.
Read 4 tweets
Joey Fox Profile picture
Jul 6, 2023
What should you ask about your indoor air quality?

There are things individuals can do to improve the IAQ in their own space, but it ultimately falls on the building owners and operators to provide clean air. Here are some things you should ask to know about the IAQ.

1/10
1. Outdoor Airflow (OA)
- Is the system constant volume or variable volume?
- If it is constant volume, what is the airflow to the room (in cubic feet per minute [CFM] or liters per second [lps])
- if it's variable volume, what is the max and min airflow?

2/10
- what is the minimum OA % supplied during occupied hours?
- what is the occupancy schedule?
- is the system always running during occupied hours/auto mode?
- how often is it checked and maintained?

Learn about ventilation systems.

3/10itsairborne.com/intro-to-venti…
Read 10 tweets
Joey Fox Profile picture
Jun 27, 2023
"We need HEPA filtration, CO2 at 600 ppm and 100% outdoor air everywhere"

I see these types of comments non-stop. They are wrong and unhelpful. They show misguided ignorance about indoor air quality and what is actually required.
I'll start with filtration - you do not care about the filter efficiency. You care about the system effectiveness which is measured as a clean air delivery rate. MERV-13 with 300 cubic feet per minute (CFM) is identical to HEPA with 230 CFM. There's no reason to prefer HEPA.
Furthermore, air handling units can't handle HEPA filters. Demanding this is absurd when it will only increase cost and won't provide any benefit over MERV-13.

Having MERV-13 as the standard is sufficient for particulate matter issues.
Read 11 tweets

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