Question Is this fan physically possible?

Jan 23, 2023
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1
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Hello,

I've come across a really cheap 12cm case fan but I'm not sure if it's over-advertised or not.
I've use other cheap fan like ID-cooling before but those are fine.
And most fan are just from China with different brand stickers and that's fine too.
Most of these have spec description that kinda make sense comparing to one another.

Until I see this fan :
https://www.lazada.co.th/products/y...500;voucherPrice:9500;timestamp:1678424615940

The spec according to the description :
  • 12cm (120x120x25mm)
  • DC 12 V Molex connector with 3pin PWN for controlling the RGB
  • 1300 RPM
  • 18 dB noise level
  • 154.5 CFM
  • Cost about $3

I've seen 150+ CFM 12cm fans but those all spin at over 3000+ RPM and make 40+ dB of noise.
I've message the seller to confirm and they said it is 154.5 CFM.
Even if they misunderstood cubic m/hr as CFM, 154.5 cubic m/hr still convert to around 90CFM
But at 1300 RPM I find it's not very believable.

They do indeed ship the fan so it's not totally 'fake' not existent fan.
But I think the spec is probably not as advertised.
I don't have anemometer to actually verify this

Is this fan even physically possible?
 
Hello,

I've come across a really cheap 12cm case fan but I'm not sure if it's over-advertised or not.
I've use other cheap fan like ID-cooling before but those are fine.
And most fan are just from China with different brand stickers and that's fine too.
Most of these have spec description that kinda make sense comparing to one another.

Until I see this fan :
https://www.lazada.co.th/products/youda-led-rgb-12cm-dc-12v-yd-pl120-led-cooling-fan-120mm-4pin3pin-silent-quiet-fan-cooler-radiator-for-pc-computer-case-11-blades-fan-i3958829075-s15296586523.html?spm=a2o4m.tm80167383.2074280300.1.aec5FcvNFcvNjm.aec5FcvNFcvNjm&priceCompare=skuId:15296586523;source:lazada-om;sn:9d18e748-2614-412f-8527-3a37fd3e2935;originPrice:9500;voucherPrice:9500;timestamp:1678424615940

The spec according to the description :
  • 12cm (120x120x25mm)
  • DC 12 V Molex connector with 3pin PWN for controlling the RGB
  • 1300 RPM
  • 18 dB noise level
  • 154.5 CFM
  • Cost about $3
I've seen 150+ CFM 12cm fans but those all spin at over 3000+ RPM and make 40+ dB of noise.
I've message the seller to confirm and they said it is 154.5 CFM.
Even if they misunderstood cubic m/hr as CFM, 154.5 cubic m/hr still convert to around 90CFM
But at 1300 RPM I find it's not very believable.

They do indeed ship the fan so it's not totally 'fake' not existent fan.
But I think the spec is probably not as advertised.
I don't have anemometer to actually verify this

Is this fan even physically possible?
Yeah, specs do look a bit inflated for a cheap fan but not impossible. It may be some knockoff or just renamed EOL from some other manufacturer.