best is to blow the air OUT of the room, no need to pump in fresh air.
Sorry but thats not true , fresh air must be pumped to cool down the machines , it's a simple rule if there is exhaust there must be intake to fill the hot air pumped out with cool fresh air.
Shouldn't the pressure created from the exhaust, if it's enough, create the suction needed to bring the fresh air in?
yes
vent >>>>>>>> gear >>>>>> exhaust fan >>>>>>
can work but many details are needed.
4 rigs could be 6 nvidia 1080 ti cards per rig or close to 4500 watts
the no fan vent could be too small.
the fanned exhaust vent needs to be strong
we have two of these
http://www.homedepot.com/p/Master-Flow-1600-CFM-Power-Gable-Mount-Attic-Fan-EGV6/205924917in the solar array we have 9kwatts of mixed gear
It's currently like this, Exhaust is the in top left of the room. The center of the room is the 4 rigs, mix of rx 470, rx 480, 24 cards total, about 4KW. In the bottom right of the room is the intake vent.
The room is small. 3.5x4.5x8. I know currently the exhaust isn't up to snuff for what I have, I'm looking at probably a 500ish CFM exhaust, or is that lowballing it? Currently I'm just using a couple small leftover furnace fans to exhaust, and that's probably the biggest issue.