Ok, for ANYONE wondering if these actually work, here is some proof. These pictures (taken from another forum and used by me solely for the purpose of providing information on this subject) were taken with an infrared thermal imager before and after psc louver installation. Read the comment in the picture for an explanation of what you are seeing.
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So if you need proof, aside from the many people providing us with their positive experiences with hood louvers, there ya go Hopefully someone can find this useful.