 Fresh Air Box Fan Blade Wire Clips, What are they for? |
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| DennisV |
  Dec 5 2025, 09:17 AM
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#1
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Senior Member  Group: Members Posts: 804 Joined: 8-August 20 From: Santa Rosa, CA Member No.: 24,575 Region Association: Northern California 
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While disassembling our fresh air box, I noticed that 3 of the fan blades have a wire clip on them. What is their purpose?
My only guess is for balancing, but seems like there would be better options to balance a plastic fan. I don't see any sensor that would be associated with them.  |
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| Superhawk996 |
Dec 5 2025, 09:19 AM
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#2
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914 Guru Group: Members Posts: 7,573 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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Used to balance the fan.
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| rgalla9146 |
Dec 5 2025, 02:52 PM
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#3
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Advanced Member Group: Members Posts: 4,888 Joined: 23-November 05 From: Paramus NJ Member No.: 5,176 Region Association: None
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QUOTE(Superhawk996 @ Dec 5 2025, 10:19 AM)  Used to balance the fan. Beat me to it (IMG:style_emoticons/default/agree.gif) |
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| bdstone914 |
Dec 6 2025, 07:23 AM
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#4
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bdstone914 Group: Members Posts: 5,206 Joined: 8-November 03 From: Riverside CA Member No.: 1,319 |
After I discovered them I had them on the tech quiz for the event we hosted. No one was able to guess what they were
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| Superhawk996 |
Dec 6 2025, 08:37 AM
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#5
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914 Guru Group: Members Posts: 7,573 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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QUOTE(bdstone914 @ Dec 6 2025, 09:23 AM) After I discovered them I had them on the tech quiz for the event we hosted. No one was able to guess what they were Worked as an engineering intern in college, job was balancing giant HVAC fans for the buildings on campus. It’s amazing how little weight is needed to balance a fan. The larger the impeller diameter is or the faster it spins the more force a tiny balance weight generates. That’s why the weights are just a thin piece of wire on these blower - they spin at a pretty decent speed. |
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