I am designing 6 custom enclosures in mild steel to be placed outdoors for 5 months in London UK. They will be interconnected, only one will contains 4 power supplies, all with conformal coating and keeping cool (don't overheat after numerous testing). There will also be two Raspberry Pis inside. Up until now I thought I would use Gore vents to avoid condensation.
Unfortunately the enclosures won't be perfectly sealed, and the enclosures will be painted with a dark colour. What type of fans (or else) should I install in order to: - provide decent air circulation - avoid condensation (fan heaters?)
Should I add vents?
Also, as the boxes will be connected with holes through which I will run cables etc, should I install such vents in each one of them or just in one of them?