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It depends as air handles somewhat like a fluid, following the path of least resistance. So either force it down the heatsink with a shroud or reduce the resistance (fin density). If the fins are already spread out enough, it might already work. But ideally you'd want air going through as much as surface area as possible, meaning forcing air through a dense fin structure. Depending on how much energy you need to dissipate, it will influence how much fin density you need.