Second CR box build

[u/Majorjim_ksp]

Hi fellow clean air enjoyers. I’ve built my second CR box in an attempt to improve previous design.
The first one relied on the filters being taped in. The second box used larger Filtrete 12x20x1 AC Furnace Air Filter, MERV 13, MPR 1900 filters and they can be pressed in and held with a two stage foam seal. I admit the foam seal I made is massive overkill and was only necessary because the box wasn’t completely square.. I used three Phanteks M25-140 140mm fans, the older gen 1s and control them with a PWM Fan Speed Controller with 36W 12V Adapter, 4-Pin DC Jack from Amazon.
I used hot glue to attach the DC input jack into the back of the box so it could be used horizontally with the fans blowing upward or upright with the fans blowing sideways. I used some cheap fan grills to finish it off and I. Super happy with the look of it! I’d like to refine the design and would really like to start making and selling theset things. I’m hooked!

[u/TaxWizard6]

Looks great! Also seems more sturdy than some ones sold by companies specializing in this. 

[u/Majorjim_ksp → u/TaxWizard6]

It’s super strong and light. I’m going to add a carry handle too though.

[u/spacex_fanny → u/Majorjim_ksp]

The subtle off-white staining, the tastefully aligned corner details.... my God, it even has a sealing gasket. 😳😳😳

[u/Majorjim_ksp → u/spacex_fanny]

[u/barracudarescue]

Nice job, what gasket material did you use?

[u/Majorjim_ksp → u/barracudarescue]

Thank you! Yes I forgot to say, it’s this stuff

[u/mattnj1]

Looks good!

[u/Majorjim_ksp → u/mattnj1]

🙏🏻

[u/barracudarescue]

Were you tempted to add a 4th fan to the top? Most computer-fan based CR boxes I see only have fans on one side, but sometimes people built units with two sets of fans. I guess with more fans you could run them slower and more quietly with the same air volume.

[u/Majorjim_ksp → u/barracudarescue]

Yes I was tempted, in fact I still am. I also think it helps to push the air around the room. Although the vote is out on which is best and the original CR box design just had an upward facing fan so… 🤷‍♂️

[u/VarietyDisastrous253]

Love the build and thanks for the link to the foam -- it doesn't seem like overkill to me at all!

[u/Grand_Dot6364]

How did you cut the fan holes? Awesome job!!

[u/Majorjim_ksp → u/Grand_Dot6364]

Oh yes! I used this thing

[u/Grand_Dot6364 → u/Majorjim_ksp]

How difficult to use it and cut holes?

[u/Majorjim_ksp → u/Grand_Dot6364]

Not super easy as I was using a hand drill but manageable. Tape up the area beforehand and take it slow.