For #1, I see what your saying the only problem about having the radiator bring air in is it will probably mess up the direction of the airflow. Also having a pull exhaust is bringing hot air out instead of bring hot air into the case because of the air going through the radiator
For #2, How is an exhaust fan bringing dust in?
I have not ordered any of my parts yet except for my case, so I do not know any of these "written instructions". Can you tell me the solution in a more basic answer like 1 exhaust in rear, 2 intake in front, etc?
I'm not an expert so excuse me for my lack of experience and knowledge
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1. The air coming in thru the radiator will increase about 3-5 C over ambient on a custom loop, much, much less on the H100i. It is then
immediately exhausted thru the rear grills .... it never gets down to your other components because it's pushed out of the case. I have tested this in the Enthoo Luxe and Primo cases using 6 temperature probes and a fog machine. I have a Pro here also but the Luxe is basically same case with extra fans and bling. Putting the fog machine on top of the case, the fog is blown out thru the rear; doesn't even get down to GFX card level.
Think about your car radiator ... does the fan blow out or in ? It brings outside cool air in, across the radiator where it immediately exits the bottom of the engine compartment. The 5C temperature rise of the air across the radiator is insignificant.
Pulling hot air thru the radiator cuts its effectiveness by 2/3. Think about it
Room Temperature = 23C
Case Temperate = 28C
Coolant temperature = 33C
The effectiveness of your radiator depends on Delta T ...
As exhaust, the 33c coolant is going thru the radiator it's seeing an air temperature gradient of say 28C at the bottom and 33 C at the top or an average of 30.5C ... average delta T is just 2.5C
Asintake, the 33c coolant is going thru the radiator it's seeing an air temperature gradient of say 23C at the top and 28C at the bottom or an average of 25.5C ... average delta T is 7.5C making it 3 times more effective.
2. The entire rear of the case is one giant open grille. You have two fans blowing air in and three fans blowing out.... so to "balance" air must come into the case from somewhere....that somewhere is that open grille on the back of the case
The entire area below the fan, other than the GFX card slot is open space and that's where dust somes in.
3. You can d/l all the manuals for each piece of equipment at any time. You should do this so as to be well infoirmed the day the boxes arrive
http://www.corsair.com/~/media/Corsair/download-files/manuals/49-000175_rev_AB_H100i_QSG_web.pdf
Page 2, box 1, 1st paragraph
Attache the radiator and fans as shown. For best cooling performance, we recommend mounting the fans as an air intake into your case.
Look at any water cooling guide and you will see the same statement.
If you haven't bought your stuff I would strongly recommend dropping the H100i and it's 60 dbA noise level in favor of the Swiftech H240-X. It's 7C cooler, 20% as loud, has a reservoir, has copper rads (100i is aluminum), has no corrosion issues (100i uses mixed metals) and if you want to add water blocks to your GFX cards someday you have that option because it has a 1.0+ gpm high head pump as compared to the h100i's 0.11 gpm pump .
http://www.hitechlegion.com/reviews/cooling/liquid/42047-swiftech-h240-x-open-loop-280mm-cpu-cooler-review?showall=&start=3