A card cage configured to hold a set of electronics cards comprises a set of walls having an input and an output and a set of flow paths formed in the set of walls to enable a fluid to flow therein. The set of flow paths includes a first flow path formed between the input and the output and in first wall from the set of walls and a second flow path formed between the input and the output and in a second wall from the set of walls. The first flow path and the second flow path are substantially the same length and a fluid flowing therein experiences substantially the same pressure drop.