drun3

t1_j22jf2o wrote

We do this at NREL for plc enclosures installed outdoors specifically. We always have a fan on one side and a louver on the opposite (both with filters), so the airflow is basically the same whether your fan is pointed in or out.

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t1_j1zgz3p wrote

I’ve always been taught to install enclosure fans blowing into the cabinet with the idea that you’re slightly pressurizing it and therefore dust isn’t being drawn into it through the seams. Genuinely curious what the reason you’ve heard for the opposite?

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