An audit on the supply side of the air system concentrates on the compressor room equipment. Data loggers are installed on each compressor to record power consumption, pressure, and in some instances, flow. Typically, a compressed air auditor spends a few hours or up to a day onsite to complete a supply-side audit. The information gained during an assessment or walkthrough is gathered during this time, if not already obtained. Data is also collected from the loggers over a period of five to seven days or as much as two weeks. The information from the data logging is then analyzed by a compressed air auditor and calculations and recommendations are made based on the data collected. From this a detailed five to 10-page report is generated outlining the condition of the supply-side equipment, how it ran, the energy consumed, and recommendations on how to improve the operation of the compressors and dryers based on the data collected.