According to the code, what class of material must nonmetallic ducts comply with?

Nonmetallic ducts are required to comply with Class 0 or Class 1 materials as specified by the North Carolina Mechanical Code. This classification indicates the fire performance characteristics of the materials used for ductwork, which is critical for ensuring safety within structures. Class 0 materials are those that have the highest fire resistance, while Class 1 materials must meet a minimum standard that prevents the spread of fire.

The codes are designed to ensure that materials used in mechanical systems can withstand fire exposure without contributing significantly to the spread of flames or smoke. This is particularly important in nonmetallic ducts, which may be more susceptible to combustion than their metallic counterparts.

Understanding the importance of these classifications helps in both compliance with the code and in ensuring the overall fire safety of the building. It is vital for professionals in the mechanical field to select appropriate duct materials that meet these fire safety standards to mitigate fire hazards effectively.