Reddit reviews Thermaltake Magnetic Fan Filter Cooling AC-003-ON1NAN-A1 Black

From what I can tell, they're these covers. Nice and cheap:

https://www.amazon.com/dp/B00KHO0CZW/ref=cm_sw_r_cp_api_KqgXAbN434R5T

For dual 140 slots, I noticed Silverstone has a pretty nice-looking option, though it looks kinda restrictive for airflow:

https://www.amazon.com/dp/B008N8GENI/ref=cm_sw_r_cp_api_mqgXAbWE37XTH

You can buy single fan filters off of amazon and such. makes it easy to add dust filtering to your case.

Ex:

https://www.amazon.ca/Thermaltake-Technoloy-Magnetic-Cooling-AC-3-ON1NAN-A1/dp/B00KHO0CZW/ref=sr_1_1?ie=UTF8&qid=1503192069&sr=8-1&keywords=thermaltake+fan+filter

So far so good! I took out the hard drive cages since I didn't need them and unfortunately there aren't dust filters on the bottom (probably because most people still use hard drives).

Instead, I got two of these: http://www.amazon.com/dp/B00KHO0I38 (I bought more fans too, the $12 Cooler Master 4-pack). The fit isn't exact, but at least it'll prevent dust. I liked it enough that I got another for the 140mm rear exhaust fan: http://www.amazon.com/dp/B00KHO0CZW No dust is getting in my new case!

A couple of things:

1. My original comment actually only applies to dual fan filters. For single fan filters they have a square filter or round filter.
   
   
2. If you look at the dimensions in the second picture, it is larger than 140mm in one direction which is what is likely causing you issues. This Thermaltake filter is 140x140mm so it will fit flush over a single fan. I personally own that filter and a 120mm version and it's pretty good.

The Meshify C is too big, the Dan Case has crap cooling (where would a fan go anyway?), and none of the other cases on the market do it for me.

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I've spent way more time on this than I should have. This is inspired by the Meshify C, the Dan Case and the DIY Perks MDF case.

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You should be able to do this with some MDF and some patience. While the dimensions aren't perfect, the final product should be around 12.3L, which is as small as it gets for having space for two 2.5" drives behind the MB, 2 platter drives, the best GPUs on the market, a CD-ROM, and the best cooling that you can get (no compromises).

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You could easily shrink it down by nixing the CD Rom and the two HDs, if you've no use for them.

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Parts:

CPU Cooler (fan oriented to draw air into the case):

https://noctua.at/en/products/cpu-cooler-retail/nh-c14s

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IO (will be placed in the DVD Drive space):

https://www.amazon.com/gp/product/B00BUUM2FU/ref=crt_ewc_img_dp_4?ie=UTF8&psc=1&smid=APIEQ5O19JI77

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GPU Filter:

https://www.amazon.com/gp/product/B07BXYWJ9K/ref=ox_sc_act_title_2?smid=A2YR19H7JUSC4V&psc=1

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CPU Filter:

https://www.amazon.com/gp/product/B00KHO0CZW/ref=crt_ewc_img_dp_3?ie=UTF8&psc=1&smid=ATVPDKIKX0DER

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Inspriations:

Meshify C (no compromises)

https://www.amazon.com/Fractal-Design-FD-CA-MESH-C-WT-TGC-Computer-Case/dp/B07BPP9KYD/ref=sr_1_2?keywords=meshify+c+mini&qid=1550477333&s=gateway&sr=8-2

Dan Case:

https://www.dan-cases.com/dana4.php

DIY Perks Case:

https://www.youtube.com/watch?v=K8hLXJUQFoc

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You should flip the rear fan to intake and get a magnetic fan filter for it, if you're concerned about dust. I like the build!