Where's the 13"'s ventilation fan?

Discussion in 'MacBook Pro' started by ramzhh, Jun 10, 2010.

  1. ramzhh macrumors regular

    Joined:
    Apr 21, 2010
    #1
    Hey guys.

    From what I think I've read somewhere, the fans on the 15'' and 17'' are on the bottom(correct me if I'm wrong, please). And because of that, leaving the MBP in a bed or on your lap would be bad. But from what I've read and seen on my 13'', the fans are between the Unibody and the screen. Is that also where the air is drawn into the vent system? I'm asking this because I've searched and still wondering whether it is safe or not to have it on my lap, since my legs wouldn't cover the air holes.

    Take care :)
     
  2. miles01110 macrumors Core

    miles01110

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    Location:
    The Ivory Tower (I'm not coming down)
    #2
    The ventilation takes place through the vents at the rear of the MBP. As long as it's not blocked, it's fine to use it however you want.
     
  3. osxtasy macrumors newbie

    Joined:
    Jun 22, 2009
    #4
    The MBP Airflow..

    The intake on ALL MBP's involve intaking the air from the space around keys on the KEYBOARD, and EXHAUSTING it out of the vent in the top of unibody/HINGE area. In my opinion, it's great for quietness, but really hinders what could be done with a PROPER dedicated intake vent, like what used to exist on the old POWERBOOKS. Hence, I(personally) heavily use smc fancontrol, and recommend it's use(on all my mac's, MBP, Mini, MacPro), ALL the time......:apple::apple::apple::apple::apple:

    In addtion, I have 4 MBP's (and a Mini, and MacPro)

    2006 15 (2 Fans)
    2008 15 (2 Fans)
    2009 15 (2 Fans)
    2009 13 (1 Fan)
     
  4. miles01110 macrumors Core

    miles01110

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    #5
    This is completely ridiculous. There's a layer of plastic in between the keyboard and the logic board/fan.
     
  5. osxtasy macrumors newbie

    Joined:
    Jun 22, 2009
    #6
    Miles, i know that, as i've taken apart 3 units, BUT its still true......

    THERE ARE NO OTHER AREAS TO INTAKE AIR. THE ONLY TRUE VENT IS THE EXHAUST VENT AT THE HINGE!!!

    Have you even thoroughlty inspected your machine??? I have, and i know it's true.....
     
  6. brdnboy macrumors regular

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    Location:
    Boulder, CO
    #7
    Nope, in every MacBook and MacBook Pro there are areas in the keyboard and of the plastic covering which allow cool air to be pulled in by the fan(s) and exhausted out the back.
     
  7. miles01110 macrumors Core

    miles01110

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    #8
    Really? Where?

    [​IMG]

    There's probably some incidental airflow through the keyboard, but it's certainly not significant. Just turned my fans up to 6k... don't feel any sort of airflow right above the keyboard.
     
  8. brdnboy macrumors regular

    Joined:
    Feb 25, 2008
    Location:
    Boulder, CO
    #9
    Sorry, I was referencing the older design. In the new design, at least in the 15" and 17" a lot of air comes through the speaker grills and some air still come through the keyboard as the plastic shield is not air tight.

    [​IMG]
    [​IMG]
     
  9. brdnboy macrumors regular

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    Feb 25, 2008
    Location:
    Boulder, CO
    #10
    Also, to add on to the ventilation topic, the way fans in MacBook Pro (and pretty much all laptops) function is to pull air in from their open tops and bottoms and the push it out the outlet, which in the MacBook Pro's case is in the back. This means that all the airspace above and below the fan is part of the thermal pathway. In the new unibody design there is a surprising amount of airspace between the bottom cover and the rest of the components inside. There is also a lot of airspace between the top case (keyboard) and the logic board. This means that a lot air that is pushed out the back is coming from random areas like the keyboard, speaker grill, ports on the side, leaks around the optical drive slot, leaks through the bottom cover, etc.

    [​IMG]
     
  10. vant macrumors 65816

    Joined:
    Jul 1, 2009
    #11
    By doing this, they cool all the other components as well. If they had a direct intake port, they would only cool the GPU/CPU.
     
  11. osxtasy macrumors newbie

    Joined:
    Jun 22, 2009
    #12
    Thank you for the break down brdnboy.

    Although I already knew how it works, I still don't believe its a very efficient means of cooling the components that make the most heat (CPU/GPU). Once again, why I use SMC fan control religiously.

    It just seems that a heat "pipe" design (over the CPU/GPU) needs a cooler DEDICATED "source" of incoming air, vs. sharing the air that is likely already warmed by passing over the other components (as it is now).

    Anyway, just my opinion...
     
  12. brdnboy macrumors regular

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    Location:
    Boulder, CO
    #13
    I agree, it is not the best way to cool off the very hot CPU and GPU die. Most other makes and models of notebooks have vents all over the bottom, sides and front. Apple has just chosen to make a more aesthetically pleasing notebook with less ventilation and make it out a heat conductive material (aluminum) and our laps suffer because of it. Thats why they claim it is a 'notebook' not meant to be used on laps... Still annoying. My current notebook is a MacBook Air and it is even worse than the MacBook and MacBook Pro in terms of heat dissipation. I have changed out the thermal paste and use SMC fan control and still suffer form overheating and core shut down.
     
  13. Ramphex macrumors 6502

    Ramphex

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    USA/PA
  14. pacmania1982 macrumors 6502a

    pacmania1982

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    Location:
    Birmingham, UK
    #15
    I'd say win as I haven't had any problem with temperatures on mine

    pac
     
  15. ramzhh thread starter macrumors regular

    Joined:
    Apr 21, 2010
    #16
    Lol now I realize that I can't have my 13'' on my lap, since the pants, from flexibility, cover the bottom part of the ventilation area. What a shame....
     
  16. osxtasy macrumors newbie

    Joined:
    Jun 22, 2009
    #17
    Originally Posted by Ramphex View Post
    so is the design win or fail?

    FAIL, but I do like my MBP's, all 3 of them. Sometimes we just have to overlook the design shortcomings( if not too blaring) and modify them as we see fit.
    I do hope Apple eventually gets it right though....:(:(:apple::apple::apple::apple::apple:
     
  17. robotmonkey macrumors 6502

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    Apr 24, 2010
    #18
    As with everything about the 13 inch, it's magical and is somehow invisible ;)
     
  18. ouimetnick macrumors 68020

    ouimetnick

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    Aug 28, 2008
    Location:
    Beverly, Massachusetts
    #19
    The unibody air intake seems like BS. I covered the top and bottom of my fan on my dell. And it blows out air. Not as strong as with it uncovered, but enough to stay cool even with max load on the chips. It LOOKS like the shaped fins pull air in, and twirl it around and shoot it out. think of a circular motion.
     
  19. Bosmonster macrumors member

    Joined:
    May 17, 2010
    #20
    Ehh.. don't worry about stuff like that. Just use it. The CPU won't overheat, it's protected. And just having something in front of the air outtake doesn't mean the air doesn't get out.

    It's pretty ridiculous not to use your laptop on your lap... It's designed to be used that way. You're overcomplicating using a device that was designed to be simple as hell.
     
  20. rubberband macrumors newbie

    Joined:
    Apr 20, 2005
    #21
    Take a close look... INGENUITY!! in plane sight

    Here is the answer most of the comments.
    You can leave it close.. or open but dont obstruct the vents!!
    the air vents work both ways,
    well more like half and half, or more like 25/75.
    you guys get the point. right?

    oh, yeah sorry for the drawings
    i dont got my stuff with me else i can even
    animate the whole thing for you

    past the green line the air is a bit warm since here the pipe is hotter,
    then it goes all the way around to hit the pipe again but on a longer
    section and escaping out. I say this is great like gasoline stove, but
    backwards. heat a bit to then burn backwards is cool a be to then chill!
    but the only problem with this u-turn design is that HEAT ALWAYS PREVAILS!!!
    ( at high temps hotter air goes in heating the whole fun-case)

    but the desing is EXCELLENT for the requirements and restrictions of the project. get what us asked: 1 inch thick, big batt, etc. only so much works!
     

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  21. AlphaDogg macrumors 68040

    AlphaDogg

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    Boulder, CO
    #22
    As someone already said, its not a laptop, its a notebook...
     
  22. BobbyCarbn macrumors regular

    BobbyCarbn

    Joined:
    Jun 21, 2009
    #23
    I your laptop doesn't have heat issues then just use it and enjoy!

    I still can not comprehend why people go buy something, then start doing the research, and when they find something not to their liking, then the company has bad engineering.

    Do your research before you plunk down 2K.

    I can see asking the questions just for sake of knowing, but calling a design FAIL just because you don't agree with the way the engineers designed it is just wrong. Do you really think Apple has grown this explosively over the past 4 years due to having sub-par engineering staff design their products? And yes they will make mistakes, but cooling in the MBP line is not been proven to be one of them.

    When you start your post with "I have an engineering degree from MIT and worked at NASA's JPL for 25 years then I may give some weight to your theories. Otherwise just use the product the way it was designed or return it.

    I will close saying, if you have major heat issues then complain away, but I don't recall seeing that in any of the posts above.

    I didnt intend to troll or flame any one with my comments, but the extent of the armchair engineering on this forum is just a little too much at times.
     
  23. Syonidism macrumors regular

    Joined:
    Feb 10, 2009
    Location:
    Turkey
    #24
    they said that the mac got too hot and burned my lap

    i said its a free cauterization.

    they said that the mac got too hot for the legs were burned.

    i said its a free epilation.

    they said that the aluminum design heated everything.

    i said its a fire shield to block the frost dragon.

    .
    .
    .
     

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