Larry Wilson, PE, Senior Vice President, Environmental Systems Design, Chicago

Understanding NFPA’s Standard 90A for air conditioning and ventilation systems

Mastering the National Fire Protection Assn. (NFPA) 90A, “Standard for the Installation of Air Conditioning and Ventilating Systems,” can be daunting. Here are some tips: Divide the work. Architects and structural engineers on the project team will define the massing, compartmentalization, interior construction details, means of egress, function of the ceiling and raised floor plenu...