Did some extra checking and the fans are fine. The problem's in the drive circuit on the control board so yanking the blue line brings 'em up to full loud 100% with no out-of-pocket.
Anyways, I no longer need A921 fans. Closing the thread.
Topic: Anyone stateside got any Avalon 921 fans? (Read 158 times)
Yep, those two are definitely the best options in their selection.
One more thing to mention, that while looking at the Digikey site,
I also found Sunon PFE0381BX-000U-S99 which is also comparable and about ten bucks lower price than Delta.
I also found Sunon PFE0381BX-000U-S99 which is also comparable and about ten bucks lower price than Delta.
Glad to help. 
I'm building a DigiKey order today anyway, may just add a couple. Thanks.
These seem to be hard to find from somewhere else than China,
for good price.
AVC DBPC1438B2H (one model that I know Canaan has used),
I only found listings in Aliexpress and some other Chinese marketplaces.
Delta PFM1412DEB7V (one that I found to be comparable with the AVC one),
this has quite good availability but eg. Digikey asks 54 bucks for one.
for good price.
AVC DBPC1438B2H (one model that I know Canaan has used),
I only found listings in Aliexpress and some other Chinese marketplaces.
Delta PFM1412DEB7V (one that I found to be comparable with the AVC one),
this has quite good availability but eg. Digikey asks 54 bucks for one.
Maybe one of these would work...
https://www.newegg.com/noctua-nf-a14-ippc-3000-pwm-case-fan/p/N82E16835608048?Description=fan&cm_re=fan-_-35-608-048-_-Product
Probably lower speed than stock, but if you're going to try to run lower power to keep the noise down maybe it would work.
Other options seem a bit too expensive:
https://www.mouser.com/Thermal-Management/Fans-Blowers/_/N-axg88?P=1yx2dyrZ1z0sdx2Z1z0xjmu&Ns=Pricing|0
https://www.newegg.com/noctua-nf-a14-ippc-3000-pwm-case-fan/p/N82E16835608048?Description=fan&cm_re=fan-_-35-608-048-_-Product
Probably lower speed than stock, but if you're going to try to run lower power to keep the noise down maybe it would work.
Other options seem a bit too expensive:
https://www.mouser.com/Thermal-Management/Fans-Blowers/_/N-axg88?P=1yx2dyrZ1z0sdx2Z1z0xjmu&Ns=Pricing|0
That's the backup plan.
3d print or make an adapter and use 120mm 10k rpm 4pins? 140mm oem is a tough find.
I've got two A921 units with dead fans and I'd really like to use them as space heaters since I'm having to run electric heat in my shop anyway. Need two replacement fans if anyone's got 'em; I'd rather not have to wait for China to come back from vacation in a week and then get shipped overseas. I've got 120mm fans from just about every model of miner to ever use 'em, but nothing for the big 140mm these take.
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