Which material is required for Type I hood construction?

Stainless steel is the required material for Type I hood construction because it is essential for its heat resistance, durability, and safety in kitchen environments where commercial cooking operations take place. Type I hoods are specifically designed to ventilate grease-laden exhaust air, which is a byproduct of activities such as frying, grilling, and sautéing. The choice of stainless steel aligns with the need for a material that can withstand high temperatures and is non-combustible.

Stainless steel is also easy to clean and maintain, which is crucial for meeting health and safety standards in commercial kitchens. Its surface can be easily sanitized, helping to prevent the build-up of grease and other contaminants that could pose a fire hazard.

Other materials like aluminum or copper may not provide the same level of heat resistance or ease of maintenance in these high-risk environments, while plastic is not suitable for construction of Type I hoods due to its combustibility and the risk of degradation from heat or grease exposure. Therefore, stainless steel is the optimal choice for ensuring safety and compliance with mechanical codes.