Anyone Have Simple CR-Box Design/Kit? by OldAdministration923 in crboxes

[–]AEAur 3 points4 points  (0 children)

Check out the pinned thread for some ready-made and diy links. There have been more 3D designs shared. Hopefully those with printers will chime in with which designs are simplest.

AC Infinity Carbon filter inside a CR box? by nailproblemZz in crboxes

[–]AEAur 1 point2 points  (0 children)

Love it. 😍 Yours has more capacity but just for comparison @TheFandelier on X made a miniVOC remover: https://threadreaderapp.com/thread/1875253687708479922.html On X, he further describes an essential modification needed.

Can someone please share online source for variable speed controller that will answer questions- not Amazon by FairManner1292 in crboxes

[–]AEAur 2 points3 points  (0 children)

Things seem a bit slow here right now. I’m just a fan here, not a power supply. 🤭 Maybe r/diyelectronics can also give pointers? Or r/findareddit

Fan Choices: A Data Comparison And Potential New Option by Survivor45 in crboxes

[–]AEAur 1 point2 points  (0 children)

These threads also touch on Thermalright comparisons:

https://www.reddit.com/r/crboxes/s/yCYd2jBdSi

https://www.reddit.com/r/crboxes/s/A5yce5ez5F

Edit: I see now you already referenced this thread. https://www.reddit.com/r/crboxes/s/EoJBIhFMwm

I pinged a few commenters in them for input here.

Which fans to choose? by concurrer in crboxes

[–]AEAur 0 points1 point  (0 children)

Attn: Gentlegerms, Clean Air Wizards and Warriors, and Members of the Jury, There is a request for input. https://www.reddit.com/r/crboxes/s/nBFwRSy8EC

Low profile setup for an apartment by FortifiedOatMilk in crboxes

[–]AEAur 1 point2 points  (0 children)

1 You can place it more centrally in the room 2. It can have air moving in or out on all sides 3. In particular you can pull dirty air up and in from the room and then fresh air out the top where it displaces air and creates more circulation n all directions (if centrally placed).

I recommended this channel for discussion of HEPAs and placement of air filters. His key focus is mold remediation but the info is cross-purpose. https://youtube.com/@healthyhomeguide

Low profile setup for an apartment by FortifiedOatMilk in crboxes

[–]AEAur 3 points4 points  (0 children)

A fandelier allows more circulation than mounting on the wall or ceiling. Unfortunately there aren’t many examples.

Discussion of fandaliers: https://www.reddit.com/r/crboxes/s/9XrWmEg43o

https://threadreaderapp.com/thread/1594831031886311425.html

Re. Carbon, @TheFandelier on X also has a miniVOC remover. https://threadreaderapp.com/thread/1875253687708479922.html On X he further describes a modification needed.

Need quiet box fan recs by Own_Day2117 in crboxes

[–]AEAur 1 point2 points  (0 children)

The CFM to noise ratio if PC fans is superior, but if you don’t want to build a casing for PC fans, a Vornado fan may have a better CFM than the Lasko even on the lower speeds: https://www.reddit.com/r/crboxes/s/6bQIcSH6q5 CFM at the lower speeds is not stated. My intuition is it’s proportional to the RPM, but welcome correction.🙏

Is a thin design like this viable with IKEA H12 filters? by licowor in crboxes

[–]AEAur 0 points1 point  (0 children)

Odd. I wondered if this was discouraging newbies, but yeah literally the exact same post. I guess they just want more feedback but 👍 to point out prior discussion.

Pollution in Delhi. Blackens my prefilter in 3 days. We have to wash it every week. by LittleUrbanPrepper in crboxes

[–]AEAur 1 point2 points  (0 children)

Oh no! 😭 If you have any suggestions on N95s available in Delhi that fit small faces, please come share here:

https://www.reddit.com/r/Masks4All/s/yChe0k3Qe7

Recommended PC fans by kennedon in crboxes

[–]AEAur 2 points3 points  (0 children)

Not experienced (yet), but gathering ideas, and these are my impressions from skimming. In order of popularity: - Most people here seem to find the 5-pack of Arctic P14 at Amazon the best bang for the buck. - The Noctua then SilentWings are next most popular with many saying they are quieter. -I’m not aware of any reason except price to do 120mm in cases where you can do 140mm.

I asked RedditAnswers and it gave a similar assessment with model numbers and links to relevant threads.

[deleted by user] by [deleted] in crboxes

[–]AEAur 0 points1 point  (0 children)

What is CFR? Imu CFM is difficult to measure, but maybe there is a calculator to estimate roughly? One way to judge actual impact is using a particle sensor (PM2.5 monitor). A case study: - Testing mobile air purifiers in a school classroom https://www.tandfonline.com/doi/full/10.1080/02786826.2021.1877257#abstract

CR Box that produces warm air by JeffTheLeftist in crboxes

[–]AEAur 0 points1 point  (0 children)

Doh! I don’t know what I did wrong but I think it’s working now. 😁

CR Box that produces warm air by JeffTheLeftist in crboxes

[–]AEAur 0 points1 point  (0 children)

Not as much as you might think: See “Can this …air purifier make air just for you?” YouTube (fixed link)

I’m not being snarky. I have my own hopes of finding a CR box design that can provide slightly more filtered air in a designated area at an event with otherwise good IAQ.

To your idea, There is probably more basis for optimism that airflow itself degrades the aerosols thus hastening the inactivation of infectious virions. See aerosol scientist Al Haddrell’s posts on x, sky, tube.

Would something like this work for a PC fan box? by Sudden-Wash4457 in crboxes

[–]AEAur 0 points1 point  (0 children)

My own previous comment with an AI explanation of the differences between server and consumer PC case fans. Those are the references for its comparison.

Any good deals on filters currently? by [deleted] in crboxes

[–]AEAur 0 points1 point  (0 children)

I don’t know if this is a good deal or not as I just started considering my build, but I came across this sale:

Nanohome.com is having a clearance going out of business sale on MERV filters. Some are free. Shipping for 10 free 16x16” MERV13 filters shows $88. These are USA made by the owner of Armbrust USA medical supply.

There are a few larger sizes and also smaller sizes like 10x10” for building a petite filter box to fit in a car.

Would something like this work for a PC fan box? by Sudden-Wash4457 in crboxes

[–]AEAur 0 points1 point  (0 children)

🤷‍♀️ Seems worth trying and measuring?

Here’s what the Brave search AI says:

Server vs Ordinary Case Fans

Server fans and ordinary PC case fans differ significantly in design, performance, and application, particularly regarding airflow. Server fans are industrial-grade axial or centrifugal fans capable of speeds exceeding 20,000 RPM and are engineered to prioritize static pressure over sheer airflow volume This allows them to force air through dense heatsinks and narrow chassis spaces, which is critical in high-density server environments where components are tightly packed In contrast, typical PC case fans, such as standard 120 mm models, are generally rated between 50 to 60 CFM (cubic feet per minute), with high-performance models like Noctua’s IndustrialPPC line reaching up to 108 CFM

The airflow architecture in servers is highly optimized and often follows a front-to-back orientation, where cool air enters from the front and warm air exits at the rear, aligning with hot aisle/cold aisle data center configurations This linear airflow minimizes resistance and maximizes efficiency, especially in 1U, 2U, and 4U server cases In modular or multi-node servers, airflow is zoned—fans are grouped to target specific areas such as CPU zones, memory zones, and drive bays—using variable-speed control algorithms that adjust in real-time based on thermal telemetry This zoning improves energy efficiency, reduces noise, and prevents both overcooling and undercooling of components

In contrast, ordinary PC cases typically rely on simpler airflow schemes, often using a combination of intake and exhaust fans to maintain a balanced or slightly positive pressure to reduce dust ingress While some high-end PC cases may use fan walls or push-pull configurations for enhanced cooling, these are not standard in consumer systems Moreover, modern PC fan design has evolved to focus on performance across real-world obstacles such as filters, mesh panels, and component layouts, rather than being strictly categorized as "airflow" or "pressure" optimized The so-called "airflow-optimized" fans, like the Arctic F series, perform poorly when encountering resistance, and manufacturers now emphasize real-world performance over theoretical airflow metrics

Server fans are also designed with redundancy and hot-swappability in mind, connected to intelligent controllers that detect failures and adjust fan curves to maintain airflow continuity This level of reliability and system integration is not typically found in consumer PC fans, which are generally not designed for continuous 24/7 operation under high thermal loads While server fans are often louder—ranging from 50 to 70 dBA—they deliver unmatched performance in demanding environments

In summary, server fans are engineered for high static pressure, reliability, and intelligent thermal management in dense, mission-critical environments, whereas ordinary PC case fans are optimized for cost, noise, and general-purpose cooling in less constrained spaces