We have a small mechanical equipment room that contains a backup diesel generator. It is being ventilated to remove exhaust and excess heat. However, ventilation rates do not meet those required per ASHRAE 62.1-2007 for an 'electrical equipment room' which seems like the closest possible space category in ASHRAE 62.1. It is unclear to me whether this is the appropriate classification, as our understanding is this classification is intended to apply to rooms with transformers and other purely electrical equipment. If not, is there a more appropriate category of space, or should we just the space to meet engineering and code requirements and not worry about ASHRAE 62.1 for that particular space?