This YouTube video from the channel "Irfan CFPS" provides a step-by-step guide on designing an automatic sprinkler system for an office using NFPA 13 standards. The video walks viewers through a nine-step formula, starting with determining the hazard occupancy classification and culminating in the location of the cross main. The presenter demonstrates each step using a specific example of a 15,000 square foot office and includes calculations for the number of branch lines, distance between sprinklers, and total number of sprinklers needed. The video emphasizes the importance of considering NFPA 13 requirements throughout the design process and encourages viewers to refer to other videos on the channel for further information on cross mains and tree systems.