You don't want to pull air out of the room. You want to move the super hot air away from the miners.

BIG DIFFERENCE.

Un-engineered, the room air will act like a heat sink, absorbing the hot air coming from the miners. Using fans to blow on the miners to "cool" them accelerates the room air heat sink effect. Then exhausting this ROOM AIR outside is very inefficient and really does not do much unless your exhaust fans are the size of a wind tunnel.

You have to directly exhaust the hot air coming from the miners. Try building an air-tight shroud structure around your miners. And fiberglass insulate. Add ductwork at the top to draw out the air to the outside. The bottom, cut a hole to which you are blowing air IN. If it is air-tight or reasonable so (the insulation and corners caulking will help a lot), the incoming cooler air will push out the hot air thru your ductwork. And you also run the fans cooler.

The smaller you can make this "shroud/air tight enclosure" (make sure you have good air circulation space around the miners though), the more efficient the cooling. Exhausting an entire room's air to the outside won't make all that much difference and you will still get overheated miners.

Experiment with miner placement and having the miner's covers off or not, have both an exhaust fan and intake fan, etc.

The overall air intake would be from plain outside air --leave open a window.