Hello,
Its not temperature controlled but it is pressure controlled with a fan speed balancer so it remains the same pressure as outside. I wish it was temperature controlled this time of year. The wind chill factor of a 60 mph wind all day is offensive. Its a cold place to work, but in summer its awesome. I wish we had shorter winetrs and longer summers. LOL

I have never seen the point in adjusting the cooling fans based on road speed anywhere other than a wind tunnel. For cooling it makes little difference as you very quickly reach the saturation point where the radiators cant really exchange anymore heat. With our very focused airflow we create an excellent pressure ahead of the heat exchangers so they work extremely well. Remember, we bring in air ported directly from outside. This is NOT recycled cell air. Its outside air, hydrocarbon free and at a strong pressure. Radial fans can only dream of creating the pressure this big fan does.






Once the heat has been removed from the heat exchangers and pumped out into the dyno cell, we need to get it out of the cell before it enters the engines air intake. Thats where most dyno cells fail. They just heat the room up ina cyclic fashion. We get it out of the cell quickly with this one: (My wifes first modelling job)










The only potential problem we hit with our 60 - 70mph front fan wind speed is if the vehicles thermostats dont work properly we can overcool the engine easily.
But the same happens on the road for that car anyway. A least we can turn the fans down.

The key to cell cooling is cell turnover. A huge cell would need much more airflow. Mine was designed from the ground up to this size in order to match the cooling I could afford to install. Via the single forced air input, the input balancers and the twin forced extraction routes the cell air here is exchanged a minimum of 600 times per hour.
For a cell twice the size, we would need twice the fans.