Quote from: T-Gee05 on November 03, 2017, 04:09:52 AM

Quote from: Sp3cul8r on November 03, 2017, 03:18:17 AM

Ok, its been awhile since I posted, but I finally got the 1200 CFM fan installed into my small space 5x5x8 converted wine room. As you can see from my pictures, Ive hung the fan from 2x4 studs. The fan utilizes 8 of 10 inch duct to expel the hot air out the side of my house. Ive also removed the old wine cooling unit and you can see the resulting open square left in the wall. I will bring fresh air in through that opening. I hooking up a generic 2.5 foot house fan to that black duct you see coming from the open square. However, thats not working at all. When I shut the door, my miners heat up to 42 C real quick. Do you guys think I need to buy another 1200 (or higher) CFM fan and push fresh air through that square? Right now, I have 5 Avalon 741s running. Im not sure how to expel all this heat effectively?

https://imgur.com/gallery/3jUrs

Thanks for your help,
Steve

Avalon 741 has a 250cfm fan. Having 5 of them gives you a total of 1250cfm. Plus the heat load from the power supply.. i suppose you have 1600W PSU running them. Your 1200CFM fan is not enough to expel all the hot air coming from your miners and power supply. Also, those flexible aluminum duct has high friction loss. Your 10" flex duct gives around 3050FPM air velocity at 1200cfm of air.

Either change your fan and make it around 1500-2000 cfm, or add another one. Then change your flex duct. It is quite small for your air volume. If the other side of that square opening where your flex duct is already outside the house, just make a screen with filter for better airflow. Window opening should be atleast 1.5 times the area of your exhaust fan duct area, BUT it should be below your miner or else there will be "short circuit" in your air flow. Fresh air will just exhaust out right away by your fan.

You have two choices the way I see it. If you don't relocate your window opening below, put a duct to your exhaust fan and extend it beside the fans of your miners so it can easily suck up the hot air (change your duct size). Or, leave your exhaust fan up there and relocate your window below, put louver/grille/screen and filter. Whichever makes it easier for you.

he is spot on that is not a good duct this is better

https://www.homedepot.com/p/Speedi-Products-16-in-x-12-ft-Insulated-Flexible-Duct-with-Metalized-Jacket-R8-FD-12R8-16/203393287?keyword=16+in+flex+duct

this is a better fan

https://www.homedepot.com/p/Master-Flow-1600-CFM-Power-Gable-Mount-Attic-Fan-EGV6/205924917

if you replace what you have with above and then use what you have to pull air in it should work.

or look at photo