If the door gets warm enough to raise your concern, I would suggest two vents; one passive to let fresh air in, and the other a power vent to pull the hot air out.
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'11 Cougar 326MKS loaded with mods
'12 Ford F250 SuperCab 6.7 PowerStroke Diesel
Amateur Radio: KD2IAT (146.520) GMRS: WQPG808 (462.675 TPL 141.3)
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