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Check my Ducted Radiator thread. I'm ducting only about 1/3 of my radiator, plus a tranny cooler with a half licence plate sized hole, and in the 107 degree temps it kept it all under 220, which is ideal for me because it keeps the fan off.
Ducting can create some perssure, were as just having an open hole that can vent to the ground or up and around the radiator is not as effective.
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