@JudahWorldChamp @kprather88 @CorsIAQ @jljcolorado @HuffmanLabDU @Poppendieck Hotels do not have shared air by design with 1 caveat.
- In your room, you will have a unit that circulates and conditions only your room air (not shared).
- This unit might be under a window, next to a window, or in corridor of your room next to the bathroom.

See pictures below
@JudahWorldChamp @kprather88 @CorsIAQ @jljcolorado @HuffmanLabDU @Poppendieck Typically, for outside air, hotels (like Hilton and Marriott) have an outside air unit on the roof that brings the air into the building.

So far so good.
Your room air is not shared air with other rooms.
@JudahWorldChamp @kprather88 @CorsIAQ @jljcolorado @HuffmanLabDU @Poppendieck There are two ways to get outside air to the room:
1- Supply outside air directly into the room. That is the preferred method. See picture below. You will see a diffuser above the ceiling, next to the bathroom.

If that is the case, your room is isolated from other rooms.
@JudahWorldChamp @kprather88 @CorsIAQ @jljcolorado @HuffmanLabDU @Poppendieck 2- Supply outside air into the corridor and then this air seeps into the room. Two issues: 1) your corridor air might be contaminated with people in the corridor and 2) it can be a bigger problem if the pressure inside the hotel is not balanced.
@JudahWorldChamp @kprather88 @CorsIAQ @jljcolorado @HuffmanLabDU @Poppendieck If you don't see a diffuser in your room (like the picture from the above tweet), it means that OA is supplied from the corridor.

I would personally do this:
1- put a towel under door opening.
2- do not turn on bathroom exh. fan until you leave the room.
@JudahWorldChamp @kprather88 @CorsIAQ @jljcolorado @HuffmanLabDU @Poppendieck Also I always keep blue tape in my bag 🤦🏻‍♀️ it comes in handy to tape un-needed airflow.

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More from @marwa_zaatari

18 Sep
📢📢New! Air Cleaners Comparison:
1- Selection graph: 1.a. all + 1.b. only HEPA
2- Data download link
3- Request data link
4- Where to place air cleaner?
5- Calculate reqs
6- CADR and noise
7- Letter about unproven tech.

@CleanAirCrewOrg @DavidElfstrom
@kprather88
1a - Selection Graph - All (includes ionizers = unproven tech)
- X axis first cost + first year filter replacement cost in USD
- Y axis: Clean Air Delivery rate = volume of clean air in CFM (cubic feet per min) = ~efficiency x airflow
1b - Selection Graph - only includes HEPA
- X axis first cost + first year filter replacement cost in USD
- Y axis: Clean Air Delivery rate = volume of clean air in CFM (cubic feet per min) = ~efficiency x airflow

Fun Fact:
On average, for each 1 cfm of clean air you pay $1.8
Read 10 tweets
25 Aug
🧵 Answers to what the different strategies will result in term of air change rate

Example used throughout the thread:
👉Classroom: 960 ft2: 30' x 32’
👉Number of occupants: 30 (this is the design number, taking into account average classroom density).
Ventilation by code, this classroom should have 415 CFM airflow of outside air or 14 CFM/person.

👉This airflow is being forced through the HVAC system (unit in classroom or mechanical room).
When we check ventilation, the answer is not “yes” or “no”, the answer should be how much?
Read 9 tweets
23 Aug
📢📢📢 Updated Air Cleaner Chart:

I added the DIY CR box as optimized by @DavidElfstrom.

Look at this beauty!! @kprather88 @JimRosenthal4
It is the most cost effective purifier on the chart.

See below 🧵 comparison to intellipure(tm) /Blueair (tm)/needle point bp ionization Image
How it compares to Intellipure?
DIY CR/DE Box is 9 times cheaper and 2 times more effective and less noisy than Intellipure! @Mssarahmssarah Image
How it compares to Blue air?
DIY CR/DE Box is ~5 times cheaper and 1.55 times more effective than Blue Air 211+ @smartrestartaps Image
Read 4 tweets
20 Aug
🧵 Is it enough?

"We did ventilation school assessment, we bought 2 air purifiers for each room for $40 million" "we conclude, it is safe to return."

A lot of time and money was spent. The school ventilation assessment is a great starting point, but what was the outcome?
Ventilation assessment reports can be found here: survey.nycsca.org/files/

I looked at many classrooms. Similar findings. Most do not have outside air and problems with exhaust fans of bathrooms (unless I am missing something - no reports it was fixed?).
Most schools have windows that can be open but windows are not a reliable method to get you a specific air change rate. For more information about ventilation:

Because mechanical ventilation is not available, a good option is to add air purifiers.
Read 7 tweets
17 Aug
🧵Following-up: I did incognito testing at a famous casino last Aug. On my there, I felt uneasy - casinos were open and schools were closed.

However, this experience opened my eyes: if casinos can open safely and do it right, so can schools..

@HuffmanLabDU @DrEricDing
COVID Safety Plan (1/2)
- People density was at 50% (by design)
- Other measures below.
Everything was followed properly, except social distancing.

Masks were enforced, even outside. One might ask how can you enforce masks if people are drunk? I saw 2 people holding a person to his room while a third person holding by two fingers his mask in place.. commitment!
Read 7 tweets
15 Aug
Updated 🧵Which air cleaner do I buy?

Type, efficiency, purchase price, replacement cost + filter life, and noise.

New results/charts about Intellipure DFS(TM), Blue Air(TM), and needle point bipolar ionization.

@DavidElfstrom @HuffmanLabDU @Parents4IAQ @RobynSchofield3
There are three types of air cleaners:
- Subtractive: like filters, will remove the contaminant when it comes in contact with the media
- Additive: like ionizers, will emit ozone/radicals/ROS/etc.. to react with the air (will emit something to remove something)
- Hybrid
Filter media (MERV, HEPA), UVGI are proven because Standards/guidelines/>decade of testing exist to test efficiency and by-products.

NO Standard exist today to test additive/electronic air cleaners (none, nada, zero, nul, nula), therefore they are Unproven.
Read 22 tweets

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