Abstract: A heat exchanger for passive heat exchange between a weather-tight, sealed electronics cabinet for exchanging heat between a heat generating side of a separating plate and an exhaust side of the separating plate is provided. The heat exchanger includes at least one layer of heat exchanger fins running in a first direction, on the heat generating side of the separating plate. The heat exchanger also includes a plurality of layers of heat exchanger fins running in a second direction, generally perpendicular to the first direction, on the exhaust side of the separating plate. The heat exchangers are sealed with a continuous gasket in the top of a cabinet housing electronic equipment.