A method of using a catalyst comprises exposing a catalyst to at least one reactant in a chemical process. A block is accommodated in this casing. The system further comprises an exhaust duct into which the electronic equipment, when installed in the rack, exhausts gas drawn from a first section of a facility. Each framing gate pair accommodates a specific corresponding vehicle body configuration. The lower average thermal mass of the walls in the first region advantageously shortens the light off time for the catalyst within the substrate to effectively neutralize automotive pollutants.