Designed a comprehensive firefighting system for a commercial/administrative building. The project featured a combination of Fire Hose Cabinets (FHC), portable extinguishers (CO2 and Powder), and a specialized Aerosol suppression system for data/IDF rooms. I calculated pipe diameters (40mm to 110mm) and coordinated the installation of OS&Y valves, flow switches, and tamper switches to ensure full compliance with safety codes.