Resources Air Density CalculatorCAM (Construction Association of Michigan)Conversion Calculator – Imperial / MetricDivize – Technical InformationEPA – Boiler MACTEngineering CalculatorsISA (The International Society of Automation)NFPA (National Fire Protection Association)OnlineconversionSEMPPES (Southeast Michigan Facilities/Power Plant Engineers Society)SensorsOne – Online ToolsSpirax Sarco Steam TablesUL (United Laboratories)