Antminer ducting

[abeandund]

I've been experimenting with ducting for purpose of reducing sound and later directing heat.  I have a s9i and a t9 with insulated 6" flexible duct.  Straight run right now and have been playing with length to monitor the sound.

I am experimenting with length but have not introduced change in direction. 3-10 feet have no noticeable negative effect on miners temps or fan speed.  Temp and fan speed have both reduced since introducing ducts.  The tube has nearly silenced the high fan noise.  Still hear the intake fan, but its a hum vs. squeal.

I haven't bought a y yet and i have one booster ready to put in use.  I'm looking about 15ft distance from miners to exit point.

I am wondering if I bring the two ducts together with a y and a booster would that handle continued length of 6" flexible ducting to direct heat outside.  If this is possible I just buy the y and assemble.

Option 2 bring ducts together but booster both ducts before y and added length.

My fall back option is booster both ducts before adding length to both.

[BitMaxz]

Which Y you are planning to buy to assemble? Do you have a sample image?

Ducting may reduce the noise but the noise still high If you want to reduce the noise I think much better to build a noise reduction with a cooler jag like the image below.



So that the noise only inside the cooler jag.

[abeandund]

I was looking at this adapter

https://www.lowes.com/pd/IMPERIAL-6-in-dia-x-6-in-dia-x-6-in-dia-Crimped-Galvanized-Steel-Full-Flow-Duct-Wye/1000237483

[Artemis3]

https://images-na.ssl-images-amazon.com/images/I/81nBVjsVxgL._SY550_.jpg

So that the noise only inside the cooler jag.

Please do not commit this mistake. IF you are going to use a box, do NOT attach the ducts directly to the fans. You can attach them to the box, but leave the miner and PSU free inside, you specially do not want to do what that picture shows. Airflow must ALSO go around the miner, otherwise you will burn the controller. You have been warned.

I was looking at this adapter

https://mobileimages.lowes.com/product/converted/063467/063467850236.jpg

This adapter is not needed at all. If you follow my advise, you don't have to worry about such thing. You can simply make two 6" holes to the box on each side instead and attach insulated ducts to those, no adapters.

Wood and insulating fabric works very well:



Notice the ducts are not attached directly to the fans, this is important, airflow must also go around the miner, not only inside the Asic boards.

Think something like this:

[abeandund]

This is how i am set up.

Box fan > wire shelf with 2 miners & psu (1 per shelf) > (6" fan adapter > 6" insulated duct)/miner= 2 exhaust ducts.

I was looking at introducing the y to combine the exhaust ducts with inline booster fan to push exhaust added distance, but I think I'd have to increase duct size rather than continue with 6" duct.  So rather than the 6x6x6 y i would need 6x6x8  or 6x6x10 with appropriate booster.

Last night i tried lengthened ducting to make curve out window on one line.  = fan speed increased and temps rose slightly.  I'll add booster and try that tonight.

[Artemis3]

Oh, you were thinking something like this?



Also consider more holes per miner, such as two for each one. In your box it would be 4 holes per side for the two miners instead of forcing it with a Y.

Perhaps a key factor is reducing the curve radius, avoid 90°, try a gentler radius like in that picture, like it was a railroad curve

[potificate]

Notice the ducts are not attached directly to the fans, this is important, airflow must also go around the miner, not only inside the Asic boards.

Is there a particular length recommended for the ducting? Are supplemental fans required to help make up for the resistance (think breathing through a straw vs freely)? Also, how much space around the ASIC should I leave inside the box?

Many thanks
potificate

[Artemis3]

Is there a particular length recommended for the ducting? Are supplemental fans required to help make up for the resistance (think breathing through a straw vs freely)? Also, how much space around the ASIC should I leave inside the box?

Many thanks
potificate

You'll have to monitor the temperatures or measure the cfm at the ends to find out. I guess if they are long enough you would indeed need supplemental inline fans, it depends on setup. Also you don't have to go with 6", you could go bigger and that might help, or twin, etc.

Please try to make sure there is airflow around the miner as well.

[mikeywith]

The length can be anything from 1m to 10m , the longer the less noise the less airflow, it pretty much depends on how cold the intake is going to be,  if you using a Y junction for all ducts then you will probably need a secondary fan to help out. But again this is not a fixed science, you need trial and error.