Electric fans

I used two fans on the radiator, one 12 inch, and one 10 inch. Two 12 inch fans wouldn't fit. Some places sell a single 14 inch fan, but two fans will draw more air, and cool a larger percentage of the radiator. A 14" fan cools 47% of the radiator, and 59% of the vertical tubes, while this setup cools 58% of the area and 93% of the vertical tubes.