I assume most miners have fans on each end, one side blowing in and the other side sucking out.
When using an external (much more powerful and more quiet) fan, what considerations could guide the decision to have it blow into or suck out of the miner?
My intention is to leave the stock fans on the miner and then blow (or suck) increasing amounts of additional air through it until the stock fans spin at their minimum rpm, or until the external fan is louder than the stock fans, whatever comes first.
I got one of these fans, it feels like it can produce at least several times the air flow that my S9J miner requires: (Don't click the link unnecessarily, bloated advertising!):
https://www.hyper-phresh.com/hyperfanThese are the specs in a nutshell:
![](https://ip.bitcointalk.org/?u=https%3A%2F%2Fi.ibb.co%2F7t5KWZc%2FPhresh.png&t=665&c=Km3b9q3GidOGDA)
It comes with a speed controller and I can print any adaptor needed to make it fit to a miner.
Specific questions that crossed my mind are these:
1) The external fan might project more noise on the outlet than the inlet side. I tested it, the noise projection seems the same in either direction. Means that from a noise reduction perspective, it does not matter which side of the fan is 'open to the environment' or maybe connected to the noise reducing ducting.
2) The fan's ability to create suction might be different from it's ability to create pressure. To be tested, not sure how, yet. I'll try to make the 3D printed adaptor so it will fit either side equally, so I can use it both ways.
3) The tubing (Seahawk acoustic duct 200mm
https://www.benchmarkbioponics.com.au/products/acoustic-polyester-ducting-100mm-x-5m ) might collapse when the fan sucks through it. Not an issue if the fan is connected directly to the miner, but might be an issue if there is a length of ducting between miner and the sucking fan. It could even be an issue if blowing into the ducting before going into the miner (i.e. it might leak or pop open), but I expect that to be much less likely than collapsing when sucked on.
Any suggestions to help understand the potential differences between blowing and sucking would be much appreciated!
![Grin](https://bitcointalk.org/Smileys/default/grin.gif)
Also, any suggestions for how to objectively test the difference once I have printed an adaptor.