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Thread: electrical fan ?

  1. #1
    Join Date
    Nov 2006
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    Delton, Michigan
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    17,475

    electrical fan ?

    if you have a fan that is single speed, and is made for exhausting fumes. if you were to put a reostat on it to slow the speed down is that going to harm the motor? and what type of motor could i do that to safely?
    If in Doubt, Build it Stout!
    One hand washes the other!
    Don't put off today till tomorrow!

  2. #2
    Join Date
    Apr 2007
    Location
    No, not all of SoCal is Los Angeles!
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    I'm no expert but I believe you are looking for a motor that has brushes like your drill or router, not like your bench grinder.
    Any sufficiently advanced technology is indistinguishable from magic.
    - Arthur C. Clarke

  3. #3
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    Dec 2006
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    Floydada, Tx
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    1,941
    need brushes or a dc motor.

  4. #4
    Join Date
    May 2008
    Location
    SouthWest GA
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    88
    No expert but you need to know the amperage/votage of the fan motor and find a fan control for that amperage and voltage. Maybe more inline with a whole house fan control but hard to tell until you know the amp/voltage.

    Hopes this helps.

    Mark

  5. #5
    Join Date
    May 2008
    Location
    SouthWest GA
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    88
    Larry, found this web site that may help in explaining about fan motor controls.

    http://www.fancollectors.org/info/speed.htm

    Mark

  6. #6
    Join Date
    May 2008
    Location
    SouthWest GA
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    Larry, one more site that may help.
    http://forums.mikeholt.com/archive/i...p/t-87376.html



    Mark

  7. #7
    Join Date
    Nov 2006
    Location
    Delton, Michigan
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    clarification!!

    ok i have been told by enuff folk that slowing a fand own with reostate isnt a good idea with what i am using so now the next question... this is going in a finish room which already has pressured air coming in room size is
    12 x 16 x10ft high.. how many cfms should i have in the fan? the presureized air is coming from a furnace fan. dont know the cfm of it???
    If in Doubt, Build it Stout!
    One hand washes the other!
    Don't put off today till tomorrow!

  8. #8
    Join Date
    May 2008
    Location
    SouthWest GA
    Posts
    88
    Larry, From looking at this web site http://www.wikihow.com/Use-a-Whole-House-Fan

    I would say you would need at least a exhaust fan with 2500 to 3000 cfm.

    But again I am no expert, heck I had to look up hoe to spell "cfm".

    You may want to go to a local HVAC shop and ask them to calculate the size exhaust fan you would need.

    Mark

  9. #9
    Larry...

    I don't know whether or not this would work for you...you're finishing room is much larger than mine. I don't have a gzinta fan, just a gzouta. I sealed the room pretty well and framed for a furnace filter in one wall. The fan will pull the door closed the last inch or so, and a thread tied to the filter stands straight out. It does a pretty good job of pulling fresh air through which is filtered for dust control. Eliminates the problem of balancing fan throughput.

    Cheers.

  10. #10
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    Nov 2006
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    Delton, Michigan
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    well i was told that!!

    presureizing the room was the best way to push put the bad fumes so that was what i did but i didnt have large enough out hole,,, been just opening the window but that lets out the bad stuff to high.. i want it to go out low where it settles first. i found a fan that is around 2000cfm so i should be in the right direction now thanks for the replies folk
    Last edited by larry merlau; 09-04-2008 at 07:55 PM.
    If in Doubt, Build it Stout!
    One hand washes the other!
    Don't put off today till tomorrow!

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