Rear fan: Intake or Exhaust

For system help, all hardware / software topics NOTE: use Coders Corner for all coders topics.

Moderators: Krom, Grendel

Post Reply
User avatar
Pumo
DBB Captain
DBB Captain
Posts: 703
Joined: Tue Jan 18, 2005 11:48 pm
Location: Mexico
Contact:

Rear fan: Intake or Exhaust

Post by Pumo » Tue Apr 15, 2014 2:16 pm

OK, in the end I got a GTX 650 for my Core i3 computer. I decided to buy a new fan for the read side of the case, I put it as intake to mantain the interior of the case cool.

Is that a good idea, or it should be better to use it as exhaust?

Is a simple case, just has a rear fan slot (no front or top) and a side (left) one. It doesn't has any fan installed in the side.
Overall I get temps of 35° to 40° on the CPU and 35°/36° on the video card when browsing, around 58° when gaming as it is now.

So, I leave it as it is (rear intake) or change it to rear exhaust?
User avatar
Krom
DBB Database Master
DBB Database Master
Posts: 15163
Joined: Sun Nov 29, 1998 3:01 am
Location: Camping the energy center. BTW, did you know you can have up to 100 characters in this location box?
Contact:

Re: Rear fan: Intake or Exhaust

Post by Krom » Tue Apr 15, 2014 2:56 pm

The only thing to avoid with fan placement would be having two fans blowing against each other. So for instance CPU fans usually are oriented so they blow from the front of the case towards the back, so you wouldn't want an intake fan blowing back at the CPU cooler.

Otherwise either way works.
User avatar
Pumo
DBB Captain
DBB Captain
Posts: 703
Joined: Tue Jan 18, 2005 11:48 pm
Location: Mexico
Contact:

Re: Rear fan: Intake or Exhaust

Post by Pumo » Tue Apr 15, 2014 4:18 pm

Well, it's not pointing towards the cpu fan, but it is basically at the same height level.
The CPU has the stock Intel cooler with its fan, blowing towards the CPU (as far as I can tell).

From a top view of the case, air is flowing like this:

Code: Select all

        
     Rear fan
          |    
          |   CPU
          |   --->
          |
         \/
    
2 DVD Writers & HDDs.
The video card is pointing downwards just below the rear fan, with its fan flowing to
the base of the case.

So it's everything OK like this?
User avatar
Krom
DBB Database Master
DBB Database Master
Posts: 15163
Joined: Sun Nov 29, 1998 3:01 am
Location: Camping the energy center. BTW, did you know you can have up to 100 characters in this location box?
Contact:

Re: Rear fan: Intake or Exhaust

Post by Krom » Tue Apr 15, 2014 4:31 pm

Stock Intel fans blow down, so that setup is fine. Only thing to keep an eye on is the HDD temps, if they get over 50C it might be a good idea to put a exhaust fan next to them that would pull air over them and out the front of the case. HDDs like to be between 35-45C, outside that range the yearly failure rate goes up by ~5% (which is a pretty small difference, but still shows up in statistics over time).
User avatar
Pumo
DBB Captain
DBB Captain
Posts: 703
Joined: Tue Jan 18, 2005 11:48 pm
Location: Mexico
Contact:

Re: Rear fan: Intake or Exhaust

Post by Pumo » Tue Apr 15, 2014 4:36 pm

My HDDs are at 36°/38°, so it seems everything is OK. :)

Thanks once more for your help Krom, your posts are always very enlightening!
Post Reply