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  1. #14
    Join Date
    Aug 2018
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    Quote Originally Posted by WAYNE3298 View Post
    Fans running backwards have low airflow and high current draw.
    Quote Originally Posted by bradluke0 View Post
    40 - 60 % when running backwards .
    Ghtukcyhmmy FBI gbbnb,9k, ,,!-ehdmRJEHHEHRRH3HEHAUaqh3j3h
    1qfhHeJEEHh


    Sent from my SAMSUNG-SM-G891A using Tapatalk

  2. #15
    Join Date
    Aug 2018
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    Quote Originally Posted by Guyinfield View Post
    Ghtukcyhmmy FBI gbbnb,9k, ,,!-ehdmRJEHHEHRRH3HEHAUaqh3j3h
    1qfhHeJEEHh


    Sent from my SAMSUNG-SM-G891A using Tapatalk
    Excuse me on this one. My kid is getting pretty good with the phone but not with spelling.

    Sent from my SAMSUNG-SM-G891A using Tapatalk

  3. Likes heatingman liked this post
  4. #16
    Join Date
    Dec 2004
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    Chicago area
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    Thread Starter
    Quote Originally Posted by WAYNE3298 View Post
    Fans running backwards have low airflow and high current draw.
    All types of fans?


    Sent from my iPhone using Tapatalk

  5. #17
    Join Date
    Aug 2002
    Location
    Southold, NY
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    Quote Originally Posted by Guyinfield View Post
    Excuse me on this one. My kid is getting pretty good with the phone but not with spelling.

    Sent from my SAMSUNG-SM-G891A using Tapatalk
    Then I wont type what my grandson says it means!

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  7. #18
    Join Date
    Feb 2016
    Location
    Louisburg Kansas
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    Not all types of fans. Some fans move about the same amount of air but the flow is reversed.
    No man can be both ignorant and free.
    Thomas Jefferson

  8. #19
    Join Date
    Nov 2016
    Location
    Huntsville, Alabama
    Posts
    326
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    I haven't studied blowers much but centrifugal pumps put out full head when running in reverse at zero flow but when you try to let it flow then the head drops right off.

  9. #20
    Join Date
    Aug 2019
    Location
    Central Florida
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    I have never tested a pump running backwards so this is a new one on me...propeller fans and the like are a different animal.

  10. #21
    Join Date
    Feb 2016
    Location
    Louisburg Kansas
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    I tested one boiler fuel oil pump that was running backwards but all I remember is the flow was really low.
    No man can be both ignorant and free.
    Thomas Jefferson

  11. #22
    Join Date
    Dec 2004
    Location
    Chicago area
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    Thread Starter
    The blower style in question is similar to a blower found in a residential furnace.

    Just alot more robust. Similar housing and wheel style.


    Sent from my iPhone using Tapatalk

  12. #23
    Join Date
    Aug 2002
    Location
    Southold, NY
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    Centrifugal pumps will load up because of check valve(s). Fans do not have checks so the blade Unloads and amperage drops

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