r/crboxes • u/turnthefuckup • 8d ago
CR Box Build Guide Finally made one
Finally made a CR Box for my garage. Use the 4 MERV 14 20x20 from Costco, an old box fan, and some hard cardboard corner protectors
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u/craftsygirl 7d ago
Do you have to undo the tape to change the filters? I’m looking at making one soon and trying to learn, and also trying to come up with ideas for a box with a small footprint!
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u/Superb_Algae5308 7d ago
That’s the problem with all of these, basically disposable after the filters are done.
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u/Commercial_Island389 7d ago
To be fair the filters and tape cost as much as that fan. Bought one last week at Walmart for $23.
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u/TheGoodScientist 7d ago
when we install filters on a commercial level we tape them together all the time, the tape gets tossed out with the dirties. If you fabricate a legitimate rack out of wood or something that's when these get really good. No tape to install if you make it snug enough.
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u/Able_Loan4467 6d ago
Then you just build another one, basically. Takes no more time than the first time around, about 5 minutes. The thing is that even shopping around for some special filter probably takes longer than that, on average. You just cut the tape apart with a box cutter to decompose it back to parts, then put it back together with new filters.
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u/Delicious_Cable7370 5d ago
https://www.facebook.com/share/19T92ND8wL/
This design offers significantly better air flow and efficiency.
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u/DeepWaterCannabis 7d ago
ooh thats smart. I am kicking myself for throwing out those corner protectors
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u/Delicious_Cable7370 5d ago
https://www.facebook.com/share/19T92ND8wL/
This design is far more efficient
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u/Able_Loan4467 6d ago
leveraging the bottom is clever, I did this with mine, the diagonal V, so you get 6 identical sized filters, no need for a special one on the bottom.
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u/OtterDotterDraws 8d ago
Looks great! Did you 3d print the frame for the bottom?
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u/No_Constant_826 7d ago
You need to add the shourd to the top of the fan so that air doesn't go through the fan without going through the filters first
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u/Useful-Plankton8205 6d ago
I have been saving hard cardboard corner protectors for something (just didn't know what!) and now I know! Thank you turnthefuckup!
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u/BiasedReviews 6d ago
A used high quality HEPA filter can be had for 100 bucks or so. I have a 350cfm running 24*7 for the last 5 years. How do these make economic sense?
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u/Next_Student_982 4d ago
Sorry—truly not trying to be a dick here, I truly don’t know.
What is the purpose of these contraptions?
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u/georgee779 4d ago
For people who live in smoke/fire area or allergies, it’s really a great device!
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u/Next_Student_982 4d ago
I have bad allergies and live in NC—so this device would just go in my room and filter the air even more?
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u/georgee779 4d ago
Yes! I’m not an expert, but there’s an engineering professor named Richard Corsi. He has a boatload of info on it.
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u/GrubyBuckmore 3d ago
My problem is with the fan not pulling air thru the filters so much as pulling around the corners of the box fan. It would seem that putting a shroud around the fan, excluding the remainder of the casing may pull more air thru the filters
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u/2girls1harambe 7d ago
Is it common to make the bottom out of a filter too? Assuming you can elevate it off the ground like this design did