This document specifies requirements and provides guidance for design, testing, installation and commissioning of heating, ventilation, air-conditioning and pressurization systems and equipment on all offshore production installations for the petroleum and natural gas industries that are ·ð new or existing, ·ð normally occupied by personnel or not normally occupied by personnel, ·ð fixed or floating but registered as an offshore production installation. This document normally applies to the overall facilities. For installations that can be subject to Class or IMO/MODU Codes & Resolutions , the user is referred to HVAC requirements under these rules and resolutions. When these requirements are less stringent than those being considered for a fixed installation, then it is necessary that this document, i.e. requirements for fixed installations, be utilized.