Thermaltake A2330
AKA Silent Wheel 13cm
I have one right here in blister pack never opened. Doni't know how well it works, but should work "reasonably" as well as any decent quiet 120mm fan. Indeed the fan blade looks just like the orange Yate Loon in my case down to the color, rough shape of fins and even the diameter. YES, the "13cm" part is the housing and the fan blades are EXACTLY THE SAME AS on a 120mm fan. I just measured, comparing it to my Cooler Master. The diameter of the blade area is 113mm on both fans. The housing on the Tt fan is larger diameter.
As for keeping dust out...
1) use a case with a dust filter
2) raise computer off ground (onto desk for instance)
3) blow it out frequently with compressed air
My computer in a CompuCase 6A19 sits on the ground and the mesh filter catches a suprising amount of dust. Most times I can peel it off in a sheet like the lint filter in my clothes dryer. The inside of my computer stays reasonably clean, with just a light film of dust. Heck, it stays cleaner than the furniture around my place. My system has total negative air pressure.