Sir: Philip Drew’s and Andrew Botros’s articles on Sydney’s Opera House (June 2019) reminded me about another part of the struggle to complete this remarkable building. As the structure progressed the engineers of the air-conditioning and fire protection company I worked for noted that there had been no discussion about the air-conditioning and fire protection systems that would be needed for this unique building. It was obvious that the loads on the architectural team to complete the detailed design and manage the basic structure were keeping then totally occupied and left little time for some of the other aspects of this…