Blowing ambient temperature air on to the heat producing rigs without any exhaust simply makes the ambient temperature hotter as time passes. You need an exhaust fan set up in the garage and move the rigs close / under the exhaust fan. That way the hot air that raises up from the rigs gets sucked out before mixing with the ambient air. A large fan with a high CFM will work wonders to maintaining the ambient temp. Don't worry about getting cold air into the room. Your garage is not an air locked chamber... there will be gaps through which air gets in. If it is indeed one of those stuffy zero ventilation garages, keep the window just barely open... like an inch or two. Dust is an issue only if you keep it full open... or if we're talking Interstellar level of dust winds
Thanks for your reply man! really appreciate it. I am going to go to my local tool store to get some pricing of a extractor fan and somehow incorporate it in my garage just to get that ambient warm air out. I think this would be the best bet because with it being a garage, it gets extremely hot in there without the miners running. I am also going to install a ceiling, which should also hopefully cool the area down.
https://www.walmart.ca/en/ip/bionaire-ultra-thin-window-fan/6000085562714?cmpid=sem_pla_google_en_none_6000085562714_100062012931728_4595&cmpid=sem_pla_google_en_none_868545256_45415463938_None_%2010002_None&gclid=CjwKCAjw6szOBRAFEiwAwzixBW9PUK0vdwlxmoqr33s8qIojVHwvkd5X4_hNImlq74_NNVglr1582xoCTNkQAvD_BwE