Page 1 of 2 12 LastLast
Results 1 to 25 of 27

Thread: Attic fan

  1. #1
    RIP
    blackgang's Avatar
    Join Date
    Dec 2006
    Last Online
    08-07-2010 @ 08:33 PM
    Location
    Phetchabun city
    Posts
    15,471

    Attic fan

    I am getting a 30 inch fan from a shop in town and I want it mounted in my attic on one end of my house and there are louvered vents on the other end to let air in and I think it will help cool the house some and make the aircon more efficient and maybe be cool enough without it sometimes.
    But am having a hard time convincing any Thai that it will help, so what do you think, I do know it helps in the states so why not here altho my rental house does not have any insulation in the ceiling so should profit more from the fan and helping to lower the attic temps.
    The guy I always hire for any building work is a fairly good size contractor and now is building a 22 mil baht apartment building, but always comes and does my stuff on weekends or sends a crew during the week as we have been friends a long time and he doesn't think it will do any good.

  2. #2
    I am in Jail
    Lily's Avatar
    Join Date
    Oct 2005
    Last Online
    14-05-2014 @ 05:06 PM
    Posts
    6,815
    Is it maybe because it is not dry heat, but humidity in Thailand?

  3. #3
    Guest Member S Landreth's Avatar
    Join Date
    Sep 2008
    Last Online
    @
    Location
    left of center
    Posts
    7,765
    Do it!

    It will help remove that hot air from the attic area (circulating the air). Roof turbines are also good and used here in Thailand,……………..I put 3 on the gf’s roof.

    A couple of roof turbines might be a good idea,.as long as you have a steady breeze outside to move the turbines. Saves on electricity.
    Keep your friends close and your enemies closer.

  4. #4
    RIP
    blackgang's Avatar
    Join Date
    Dec 2006
    Last Online
    08-07-2010 @ 08:33 PM
    Location
    Phetchabun city
    Posts
    15,471
    ya mean like these, I had 2 put on after the new roof went on.




  5. #5
    Guest Member S Landreth's Avatar
    Join Date
    Sep 2008
    Last Online
    @
    Location
    left of center
    Posts
    7,765
    Yes! But there are different size turbines that will move different amounts of air out of the attic area depending on wind speed.
    Just from the looks of it (your roof and what I can see) you have a nice size roof and you might need more than two of those turbines.

    There are charts that will show you how much volume of air that each size turbine will move depending on certain wind speeds.

    It might be best to look for some of those charts and figure the amount of volume of air you want moved from your attic space.

    I over did the gf’s home here in BKK. I had them install 3 large turbines and with a 5 mph wind they will remove the air in the attic space in no time. I also had some guys come over a put some vents in the soffits in the home.

    Do you have vents in the soffits?

  6. #6
    Guest Member S Landreth's Avatar
    Join Date
    Sep 2008
    Last Online
    @
    Location
    left of center
    Posts
    7,765
    Oh! After a second look at those turbines of yours (the one in the picture),…………………they don’t look like they are properly installed???????????????????

  7. #7
    watterinja
    Guest
    BG, it will help - there is no question.

    You will be removing the super-hot air layer that sits above your ceiling. This will then present less heat load to the internal air-con system.

    I put the same system in a house I built in Isaan in previous years.

  8. #8
    RIP
    blackgang's Avatar
    Join Date
    Dec 2006
    Last Online
    08-07-2010 @ 08:33 PM
    Location
    Phetchabun city
    Posts
    15,471
    Quote Originally Posted by watterinja
    BG, it will help - there is no question.
    Cant convince a Thai tho.

    Quote Originally Posted by S Landreth
    Oh! After a second look at those turbines of yours (the one in the picture),…………………they don’t look like they are properly installed???????????????????
    Yea, they supposed to be on 14" openings so I made the adapters to mount em on the roof ridge



    Quote Originally Posted by S Landreth
    Do you have vents in the soffits?
    Don't know, never heard of one before.


  9. #9
    Thailand Expat
    ceburat's Avatar
    Join Date
    May 2006
    Last Online
    30-08-2011 @ 09:42 AM
    Posts
    1,473
    My experience in High Ridge Mo, USA, a hot and humid area in summer was an attic fan and two wind turbins on the roof of a small 30 foot by 24 foot two level home. The attic fan was installed in the ceiling drawing air in thru the windows and up into the attic. The wind turbins were required to allow the volume of air out. The home went from being very hot and humid to being so confortable that we never did install an air conditioner. Roof vents are not normally large enough for the volume of air coming from a good attic fan. The fan was a two speed, 30 inch, I think. I am planing to install one here but I have a worry about the mon soon rains we get here. May a nice wet attic with wind driven rains on wind turbins.

  10. #10
    ding ding ding
    Spin's Avatar
    Join Date
    Jul 2006
    Last Online
    @
    Posts
    12,608
    Quote Originally Posted by blackgang
    Cant convince a Thai tho.
    Educated Thais know all about this concept. Your problem is that the average fcukwit whos job it is to go up the ladder and install the thing thinks he knows it all but in fact couldnt tell you what 9 x 7 equals without looking for an electronic calculator.

    On the other hand us stupid farangs know that the air inside the roof space will be something like 36-46 degrees by late afternoon. Having the 30 inch fan installed at one end of the roof will force out this air and if ran for a couple of hours just after sundown will draw in slightly cooler air in.
    The objective is to lower the temperature in there only by about 3-5 degrees.
    Before having the fan installed, try and establish the general direction of the natural breeze and wind in your area in relation to the house itself. Dont install the fan so that it fights that breeze.
    Expect to replace the fan every couple of years because the motor bearings / windings wont last long due to the heat.
    Originally Posted by Smeg
    ... I like to fantasise sometimes, and I lie very occasionally... my superior home, job, wealth, freedom, car, girl, retirement age, appearance, satisfaction with birth country etc etc... Over the past few years I have put together over 100 pages on notes on thaiophilia...

  11. #11
    Guest Member S Landreth's Avatar
    Join Date
    Sep 2008
    Last Online
    @
    Location
    left of center
    Posts
    7,765
    The adaptor you made for the turbines look good,……but it looks like the flow of air could be restricted.

    About vents and soffits,………….(I think,.just because I was raised in S Florida, where we have extreme heat to deal with during some parts of the year) you might want to consider vents in the soffits. I think every home should have them,..it lets air flow into the attic space and if you have turbines on the roof (drawing air from the attic) it gives the attic a place to draw fresh (cooler) air from. If you did not have any vents,………it would be like a vacuum.

    You can read a set of prints,…………..here is a site with a diagram showing vents in the soffits. I think you’ll understand once you view the site. I just had holes drilled into the soffits here and then had the guys place a fine wire mesh (screen) over the holes,.so the bugs wouldn’t get in as easy.

    http://www.doityourself.com/stry/roofingsoffits

    Also “Deck Ape” has his thread “Deck Ape's Big Gringo House” look through it (last few pages?) and you’ll see he has vents in his soffits,…………we both make commits about them. It is a good pictorial (look at posts 297, 263 and 232*).

    By the way “Spin” posted a good commit, here! You might want to listen to what he said………………………..”Before having the fan installed, try and establish the general direction of the natural breeze and wind in your area in relation to the house itself. Don’t install the fan so that it fights that breeze.”

  12. #12
    RIP
    blackgang's Avatar
    Join Date
    Dec 2006
    Last Online
    08-07-2010 @ 08:33 PM
    Location
    Phetchabun city
    Posts
    15,471
    I did and the fan is going in the south end and our wind mostly out of the north.

    So what is a soffit? is that air vents under the roof tiles.
    And if so, then yes, the plastic bird blocks that came with the roofing tiles down to the wall caps are slotted for ventilation between the tile and the alum insulation about 2 inches below the tiles.?
    Plus that insulation there is 6 inches of it on top or the ceiling sheetrock..

    But I don't live in that house cause it is in a Thai village about 6 kliks down the road and them brain dead cocksuckers were just lucky I didn't kill a bunch of them as I am one of the people that continuous noise makes a little nuts and if I woild have had a gun there would sure be some dead assholes there.

  13. #13
    ding ding ding
    Spin's Avatar
    Join Date
    Jul 2006
    Last Online
    @
    Posts
    12,608
    Quote Originally Posted by blackgang
    were just lucky I didn't kill a bunch of them
    Try and keep this thread on topic...blowing away hot air and not khun bannnork

  14. #14
    I am in Jail

    Join Date
    Feb 2009
    Last Online
    17-02-2013 @ 01:45 PM
    Location
    Melbourne
    Posts
    450
    Soffit or eve is where the roof overhangs the building! The lining is usally of cement sheet and has holes or slottes cut in to let the air in. By your photo you have a pitched gable roof, which means the short side of your house, the ceiling/attic space does not over hang the building, as you said you have louvers, so an exhaust fan placed at the opposite side, of where the wind comes in will work!

    Try blowing on the contractors! And see if they get the jist!
    Lift your feet!

  15. #15
    Member
    Join Date
    Aug 2006
    Last Online
    08-06-2019 @ 08:07 AM
    Location
    Brooksville Florida
    Posts
    141
    I Have a 30 foot wide house in Fl with a 6 ft tall attic. I put a 4 X 3 feet opening with screen only on end gables, have a 2 foot roof over hang, and get no water in attic from blowing in. hits screen and flows down side of bldg. Then have attic squirrel cage, which moves much more air then fan blade fan. Thermostate turns it on at 100 degrees. can get to 145 degrees with no fan, also have 12 inches of insulation. cheap to cool, shop same way, holds AC cool air in all
    night is much cooler then outside air in morning when I step into room. I bought house in BIRMINGHAM al, and no insulation in 40 yr old house. first thing I did was blow in 12 ", 78 yr old neighbor came over to see me and said my house was lots cooler then hers. sure enough no insulation, I did her attic also cost$ 250.00 for insulation, saved her $120.00 first month on elect bill, which can run $300. up per month. No excuse for insulation and vent attics and fans.

  16. #16
    Newbie
    Join Date
    Nov 2008
    Last Online
    31-05-2011 @ 04:28 AM
    Location
    Chiang Mai
    Posts
    32
    Hey BG you should definitely put in some soffit vents. You can't have too much ventilation and when you put a screen over any hole you reduce the space by 50%.

  17. #17
    RIP
    blackgang's Avatar
    Join Date
    Dec 2006
    Last Online
    08-07-2010 @ 08:33 PM
    Location
    Phetchabun city
    Posts
    15,471
    Yes, I just went out and looked and these brain dead assholes did the same thing they tried to do when we built our house,, there is no vents at all, anywhere so I called my contractor and he will have a crew here tomorrow to put some in,, I never thoughht to check it before, but i should know it would have been the Thai way and not the correct way.

  18. #18
    Thailand Expat jandajoy's Avatar
    Join Date
    Mar 2008
    Last Online
    02-11-2016 @ 08:50 AM
    Posts
    19,599
    Insulation makes a huge difference too.

  19. #19
    RIP
    blackgang's Avatar
    Join Date
    Dec 2006
    Last Online
    08-07-2010 @ 08:33 PM
    Location
    Phetchabun city
    Posts
    15,471
    Our house has 6 inches of fiberglas blanket encased in alum. foil on the ceilings and a thin sheet of laminated foil and fiber 3 inches below the roof tiles that does transfer a lot of heat to the ridge purlins and into the turbo vents from the suffit vents that let air in between the tiles and the insulated foil.

  20. #20
    Thailand Expat jandajoy's Avatar
    Join Date
    Mar 2008
    Last Online
    02-11-2016 @ 08:50 AM
    Posts
    19,599
    sounds fokin good. It's what we did to our house in FNQ 8 years ago. Similar climate. Only thing I'd suggest is the positioning of the whirly on the roof.

    We put 2, 1/2 a meter down from the peak, opposite each other. Seemed to work well at getting that hot air out. The thermals ran 'em.

  21. #21
    RIP
    blackgang's Avatar
    Join Date
    Dec 2006
    Last Online
    08-07-2010 @ 08:33 PM
    Location
    Phetchabun city
    Posts
    15,471
    here some pix of the tiles and insulation going on




  22. #22
    RIP
    blackgang's Avatar
    Join Date
    Dec 2006
    Last Online
    08-07-2010 @ 08:33 PM
    Location
    Phetchabun city
    Posts
    15,471
    Then when they finish the tiles they went inside and took down the square shit that the orig guy put in for ceilings and put up sheetrock drywall board and reinsulated it..

  23. #23
    Thailand Expat jandajoy's Avatar
    Join Date
    Mar 2008
    Last Online
    02-11-2016 @ 08:50 AM
    Posts
    19,599
    looking at those pics I'd say you're biggest issue is getting the accrued heat out. Insulation looks good.

    The whirly gig thing you've placed is not going to draw enough hot air. Economical as they are I'd fit another 2-3 and not on the ridge with restricted out flow.

  24. #24
    RIP
    blackgang's Avatar
    Join Date
    Dec 2006
    Last Online
    08-07-2010 @ 08:33 PM
    Location
    Phetchabun city
    Posts
    15,471
    Nope, I have no problems with that house and I damn sure aint fucking up the tile roof to put on vents.the heat that comes up is taken out bt the turbos and what is under that alum sheet goes out the attic vents in the ebds of the house, it is fine,
    But I do not now live in that house as it is in a noisy village and it gets worse every year and now if I have to live there I would end up killing a bunch of the brain dead cocksuckers, so I rent another house and thats where I live and will have to do something to this house, I just showed you that I do understand what it takes and I do know how to fix it, but you can't convince a Thai.

  25. #25
    Member
    Join Date
    Feb 2009
    Last Online
    05-08-2015 @ 12:52 AM
    Location
    UK and Isaan
    Posts
    120
    I'm another who'd heard that the insulation with a reflexive foil covering is the way to go. The fan is an interesting idea but probably doesn't work without the gable end and vents.

Page 1 of 2 12 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •