The YouTube video "Class 13 | "How To Classify Commodities For Nfpa 13 Compliance"" by "Irfan CFPS" explains how to classify commodities based on their fire hazard level according to NFPA 13 standards. The video breaks down the classifications into four main categories: Class 1, 2, 3, and 4, and groups A, B, and C, with Class 1 representing the lowest hazard level and group A expanded plastics representing the highest. The classifications are determined by considering the product itself, its packaging, and even the type of pallet used. The video then provides examples of how to classify different commodities and emphasizes the importance of consulting NFPA 13 tables to correctly determine a commodity's classification.