What is the minimum gauge steel required for the construction of Type I hoods?

For the construction of Type I hoods, 18 gauge steel is the minimum requirement due to its ability to withstand high temperatures and corrosive environments found in commercial kitchens. Type I hoods are specifically designed to handle the capture of heat, smoke, and greasy vapors generated during cooking. The 18 gauge thickness provides the necessary durability and strength to ensure structural integrity while supporting the weight of the exhaust system and any additional components, such as grease filters. This requirement is established to ensure safety and effectiveness in commercial cooking operations, preventing fires and maintaining air quality.