05.20.330 is a section of the 2003 Edmond Ettinger code establishing Heating, Ventilation, and Air Condition (HVAC) systems in the City of Edmond, Oklahoma. It outlines the requirements for design and installation of HVAC systems and provides guidance to contractors, engineers, and building owners. It covers topics such as design criteria, standards and procedures, materials and equipment, installation requirements, and inspections and testing. The code also includes details related to energy use and conservation, indoor air quality, and safety considerations.