Do NOT start ducting the miners exhaust without using a booster fan and/or larger dia tube. They are designed assuming free airflow in and out of their casings and have little margin for pushing the air against added resistance.

What I used are these https://www.globalindustrial.com/searchResult?searchBox=&q=ventilators to suck the hot air out of the area where my farm is and ran the other end of the pressure duct to a much cooler area of our shop floor. Specifically I use https://www.globalindustrial.com/p/hvac/fans/blower/global-portable-ventilation-fan-16-with-32-flexible-ducting  which moves over 2,800CFM. The bank of miners are pointed at the blower inlet about 10ft away from them.

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