According to the code, what material can be used for duct construction for domestic range hoods?

The correct material for duct construction for domestic range hoods, as per code, is galvanized steel. This selection is based on several factors important for safety and performance in kitchen environments.

Galvanized steel is non-combustible, meaning it does not catch fire easily, which is essential in the context of a kitchen where heat and flames can be present during cooking. Its durability also ensures a long lifespan, as it can withstand high temperatures and resist corrosion from kitchen vapors and grease. Additionally, galvanized steel has smooth surfaces that help facilitate proper airflow, minimizing the accumulation of grease and ensuring efficient ventilation.

While other materials like PVC and fiberglass might be used in some applications, they do not meet the necessary fire safety standards for use in range hood ducting. PVC, for example, can melt at high temperatures, and fiberglass can absorb moisture and odors, which is not ideal in a cooking environment. Wood is also not considered suitable due to its combustible nature and potential to harbor grease, making it a fire hazard.